slideShowURL = 'SlideShow_assets/SlideShow.html';       // parameter from openSlideShowWindow.js
slideShowNS4URL = 'SlideShow_assets/SlideShowNS4.html'; // parameter from openSlideShowWindow.js

slides = new Array();
slides[0] = new Slide('../Location Shots_files/001.jpg', '531', '800', 'I’m at the entry of the mine shaft in Wyoming  where the rock used to make baking soda and baking powder comes from. Went 1600 feet down--and then drove in a Jeep for 30 minutes! I’m carrying emergency breathing gear.');
slides[1] = new Slide('../Location Shots_files/002.jpg', '525', '800', 'The trucks used to haul phosphorus ore are not small.  And the ore looks like dirt.  The phosphorus goes into baking powder, a white powder. Go figure.');
slides[2] = new Slide('../Location Shots_files/IMG_0994.jpg', '600', '800', 'This place, right along the Missouri River, not only makes lactic acid for sodium stearyoyl lactylate, but 5 million pounds of high-fructose corn syrup a day.');
slides[3] = new Slide('../Location Shots_files/IMG_0797.jpg', '800', '600', 'Tasting totally saturated brine, direct from an underground salt deposit, before it gets refined.  I had to wear beard and hair nets because it was on its way to becoming food.\n\n');
slides[4] = new Slide('../Location Shots_files/IMG_1485.jpg', '600', '800', 'The thousands of polished stainless steel pipes in this whey plant made it look like an industrial disco to me.');
slides[5] = new Slide('../Location Shots_files/IMG_1489.jpg', '800', '600', 'The whey plant presents a kind of Olympics for plumbing.');
slides[6] = new Slide('../Location Shots_files/IMG_1008.jpg', '600', '800', 'Checking out a rich cornfield in Sydney, western Iowa. Now they leave a fair amount of trash from the cornstalk on the surface, to protect and enrich the soil.');
slides[7] = new Slide('../Location Shots_files/IMG_1563.jpg', '600', '800', 'Getting to know baby soybean plants in Assumption, Illinois.  ');
slides[8] = new Slide('../Location Shots_files/IMG_1559.jpg', '600', '800', 'A combine harvester is not a simple machine.');
slides[9] = new Slide('../Location Shots_files/IMG_1629.jpg', '600', '800', 'The Mississippi River along Iowa (Clinton, here) is busy with barges full of corn or soybeans that must dodge bridges and fit into numerous locks.  The tugboats look like small factories.');
slides[10] = new Slide('../Location Shots_files/IMG_1527.jpg', '600', '800', 'Some of the world’s biggest factories for processing corn and soybeans have their own power plants.');
slides[11] = new Slide('../Location Shots_files/IMG_1533.jpg', '600', '800', 'Power supply near a large processing plant.');
slides[12] = new Slide('../Location Shots_files/IMG_1549.jpg', '600', '800', 'Most corn and soybean processing plants are in relatively urban areas.');
slides[13] = new Slide('../Location Shots_files/IMG_1605.jpg', '600', '800', 'Some are VERY urban.');
slides[14] = new Slide('../Location Shots_files/IMG_1016.jpg', '600', '800', 'A flour mixture quality control lab uses an extraordinary array of powerful analytical equipment.    ');
slides[15] = new Slide('../Location Shots_files/IMG_1024.jpg', '600', '800', 'This is where they make the best emulsifiers in the world--mono- and diglycerides and sodium stearoyl lactylate.\n\n\n\n\n\n');
isPureISOLatin1 = true;
contentEncodingConstant = 4;
feedbackURL = "TODO";
showFeedbackButton = false;
feedbackEnabled = true;

IMpreload('Location Shots_files', 'shapeimage_3', '0');
IMpreload('Location Shots_files', 'shapeimage_3', '1');
var MINIMUM_FONT = "10";
var UNITS = "";

function elementFontSize(element)
{
    var fontSize = MINIMUM_FONT; 

    if (document.defaultView)
    {
        var computedStyle = document.defaultView.getComputedStyle(element, null);
        if (computedStyle)
        {
            fontSize = computedStyle.getPropertyValue("font-size");
        }
    }
    else if (element.currentStyle)
    {
        fontSize = element.currentStyle.fontSize;
    }

    if ((UNITS.length == 0) && (fontSize != MINIMUM_FONT))
    {
        UNITS = fontSize.substring(fontSize.length - 2, fontSize.length)
    }

    return parseFloat(fontSize);
}

function adjustFontSizeIfTooBig(idOfElement)
{
    var oTextBoxOuterDiv;
    var oTextBoxMiddleDiv;
    var oTextBoxInnerDiv;
    var oTextBoxOuterDiv = document.getElementById(idOfElement);
    
    if (oTextBoxOuterDiv)
    {
        oTextBoxMiddleDiv = getChildOfType(oTextBoxOuterDiv, "DIV", 0);
        if (oTextBoxMiddleDiv)
        {
            oTextBoxInnerDiv = getChildOfType(oTextBoxMiddleDiv, "DIV", 0);
            if (oTextBoxInnerDiv)
            {
                var offsetHeight = oTextBoxInnerDiv.offsetHeight;
                var specifiedHeight = offsetHeight;
                if (oTextBoxMiddleDiv.style.height != "")
                {
                    specifiedHeight = parseFloat(oTextBoxMiddleDiv.style.height);
                }
                else if (oTextBoxOuterDiv.style.height != "")
                {
                    specifiedHeight = parseFloat(oTextBoxOuterDiv.style.height);
                }
                if (offsetHeight > specifiedHeight)
                {
                    var smallestFontSize = 200;
                    
                    var aParaChildren = getParaDescendants(oTextBoxInnerDiv);
                    var oneLine = false;
                    for (i = 0; i < aParaChildren.length; i++)
                    {
                        var oParagraphDiv = aParaChildren[i];
                        var lineHeight = elementLineHeight(oParagraphDiv);
                        oneLine = oneLine || (lineHeight * 1.5 >= specifiedHeight);
                        if (oParagraphDiv.nodeName == "DIV")
                        {
                            var fontSize = elementFontSize(oParagraphDiv);
                            smallestFontSize = Math.min( smallestFontSize, fontSize );
                            for (j = 0; j < oParagraphDiv.childNodes.length; j++)
                            {
                                var oSpan = oParagraphDiv.childNodes[j];
                                if ((oSpan.nodeName == "SPAN") || (oSpan.nodeName == "A"))
                                {
                                    fontSize = elementFontSize(oSpan);
                                    smallestFontSize = Math.min( smallestFontSize, fontSize );
                                }
                            }
                        }
                    }
                    var minimum = parseFloat(MINIMUM_FONT);
                    
                    var count = 0
                    while ((smallestFontSize > minimum) && (offsetHeight > specifiedHeight) && (count < 10))
                    {
                        ++ count;
                        if (oneLine)
                        {
                            var oldWidth = parseInt(oTextBoxOuterDiv.style.width);
                            oTextBoxInnerDiv.style.width =
                                "" + oldWidth * Math.pow(1.05, count) + "px";
                        }
                        else
                        {
                            var scale = Math.max(0.95, minimum / smallestFontSize);
                            
                            for (i = 0; i < aParaChildren.length; i++)
                            {
                                var oParagraphDiv = aParaChildren[i];
                                if (oParagraphDiv.nodeName == "DIV")
                                {
                                    var paraFontSize = elementFontSize(oParagraphDiv) * scale;
                                    var paraLineHeight = elementLineHeight(oParagraphDiv) * scale;
                                    for (j = 0; j < oParagraphDiv.childNodes.length; j++)
                                    {
                                        var oSpan = oParagraphDiv.childNodes[j];
                                        if ((oSpan.nodeName == "SPAN") || (oSpan.nodeName == "A"))
                                        {
                                            var spanFontSize = elementFontSize(oSpan) * scale;
                                            var spanLineHeight = elementLineHeight(oSpan) * scale;
                                            oSpan.style.fontSize = spanFontSize + UNITS;
                                            oSpan.style.lineHeight = spanLineHeight + UNITS;
                                            smallestFontSize = Math.min( smallestFontSize, spanFontSize );
                                        }
                                    }
                                    oParagraphDiv.style.fontSize = paraFontSize + UNITS;
                                    oParagraphDiv.style.lineHeight = paraLineHeight + UNITS;
                                    smallestFontSize = Math.min( smallestFontSize, paraFontSize );
                                }
                            }
                        }
                        
                        offsetHeight = oTextBoxInnerDiv.offsetHeight;
                    }
                }
            }
        }
    }
}


function elementLineHeight(element)
{
    var lineHeight = MINIMUM_FONT; 
    
    if (document.defaultView)
    {
        var computedStyle = document.defaultView.getComputedStyle(element, null);
        if (computedStyle)
        {
            lineHeight = computedStyle.getPropertyValue("line-height");
        }
    }
    else if (element.currentStyle)
    {
        lineHeight = element.currentStyle.lineHeight;
    }
    
    if ((UNITS.length == 0) && (lineHeight != MINIMUM_FONT))
    {
        UNITS = lineHeight.substring(lineHeight.length - 2, lineHeight.length)
    }
    
    return parseFloat(lineHeight);
}

function adjustLineHeightIfTooBig(idOfElement)
{
    var oTextBoxOuterDiv;
    var oTextBoxMiddleDiv;
    var oTextBoxInnerDiv;
    var oTextBoxOuterDiv = document.getElementById(idOfElement);
    
    if (oTextBoxOuterDiv)
    {
        oTextBoxMiddleDiv = getChildOfType(oTextBoxOuterDiv, "DIV", 0);
        if (oTextBoxMiddleDiv)
        {
            oTextBoxInnerDiv = getChildOfType(oTextBoxMiddleDiv, "DIV", 0);
            if (oTextBoxInnerDiv)
            {
                var offsetHeight = oTextBoxInnerDiv.offsetHeight;
                var specifiedHeight = offsetHeight;
                if (oTextBoxMiddleDiv.style.height != "")
                {
                    specifiedHeight = parseFloat(oTextBoxMiddleDiv.style.height);
                }
                else if (oTextBoxOuterDiv.style.height != "")
                {
                    specifiedHeight = parseFloat(oTextBoxOuterDiv.style.height);
                }
                if (offsetHeight > specifiedHeight)
                {
                    var adjusted = true;
                    var count = 0;
                    while ((adjusted) && (offsetHeight > specifiedHeight) && (count < 10))
                    {
                        adjusted = false;
                        ++ count;
                        
                        var aParaChildren = getParaDescendants(oTextBoxInnerDiv);
                        for (i = 0; i < aParaChildren.length; i++)
                        {
                            var oParagraphDiv = aParaChildren[i];
                            if (oParagraphDiv.nodeName == "DIV")
                            {
                                var fontSize = elementFontSize(oParagraphDiv);
                                var lineHeight = elementLineHeight(oParagraphDiv) * 0.95;
                                if (lineHeight >= (fontSize * 1.1))
                                {
                                    oParagraphDiv.style.lineHeight = lineHeight + UNITS;
                                    adjusted = true;
                                }
                                
                                
                                
                                for (j = 0; j < oParagraphDiv.childNodes.length; j++)
                                {
                                    var oSpan = oParagraphDiv.childNodes[j];
                                    if ((oSpan.nodeName == "SPAN") || (oSpan.nodeName == "A"))
                                    {
                                        var fontSize = elementFontSize(oSpan);
                                        var lineHeight = elementLineHeight(oSpan) * 0.95;
                                        if (lineHeight >= (fontSize * 1.1))
                                        {
                                            oSpan.style.lineHeight = lineHeight + UNITS;
                                            var adjusted = true;
                                        }
                                    }
                                }
                            }
                        }
                        
                        offsetHeight = oTextBoxInnerDiv.offsetHeight;
                    }
                }
            }
        }
    }
}

var smallTransparentGif = "";
function fixupIEPNG(strImageID, transparentGif) 
{
    smallTransparentGif = transparentGif;
    if (windowsInternetExplorer && (browserVersion < 7))
    {
        var img = document.getElementById(strImageID);
        if (img)
        {
            var src = img.src;
            img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')";
            img.src = transparentGif;
            img.attachEvent("onpropertychange", imgPropertyChanged);
        }
    }
}

function fixupIEPNGBG(oBlock) 
{
    if (oBlock)
    {
        var currentBGImage = oBlock.currentStyle.backgroundImage;
        var currentBGRepeat = oBlock.currentStyle.backgroundRepeat;
        var urlStart = currentBGImage.indexOf('url(');
        var urlEnd = currentBGImage.indexOf(')', urlStart);
        var imageURL = currentBGImage.substring(urlStart + 4, urlEnd);

        if (imageURL.charAt(0) == '"')
        {
            imageURL = imageURL.substring(1);
        }
        
        if (imageURL.charAt(imageURL.length - 1) == '"')
        {
            imageURL = imageURL.substring(0, imageURL.length - 1);
        }

        var overrideRepeat = false;

        var filterStyle =
            "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" +
            imageURL +
            "', sizingMethod='crop');";

        if (RegExp("/C[0-9A-F]{8}.png$").exec(imageURL) != null)
        {
            filterStyle =
                "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" +
                imageURL +
                "', sizingMethod='scale');";

            overrideRepeat = true;
        }

        var backgroundImage = new Image();
        backgroundImage.src = imageURL;
        var tileWidth = backgroundImage.width;
        var tileHeight = backgroundImage.height; 
        
        var blockWidth = 0;
        var blockHeight = 0;
        if (oBlock.style.width)
        {
            blockWidth = parseInt(oBlock.style.width);
        }
        else
        {
            blockWidth = oBlock.offsetWidth;
        }
        if (oBlock.style.height)
        {
            blockHeight = parseInt(oBlock.style.height);
        }
        else
        {
            blockHeight = oBlock.offsetHeight;
        }

        if ((blockWidth == 0) || (blockHeight == 0))
        {
            return;
        }
        
        var wholeRows = 1;
        var wholeCols = 1;
        var extraHeight = 0;
        var extraWidth = 0;
        
        if ((currentBGRepeat.indexOf("no-repeat") != -1) ||
              ((tileWidth == 0) && (tileHeight == 0)) ||
              overrideRepeat)
        {
            tileWidth = blockWidth;
            tileHeight = blockHeight;

        }
        else if ((currentBGRepeat.indexOf("repeat-x") != -1) ||
              (tileHeight == 0))
        {
            wholeCols = Math.floor(blockWidth / tileWidth);
            extraWidth = blockWidth - (tileWidth * wholeCols);
            tileHeight = blockHeight;

        }
        else if (currentBGRepeat.indexOf("repeat-y") != -1)
        {
            wholeRows = Math.floor(blockHeight / tileHeight);
            extraHeight = blockHeight - (tileHeight * wholeRows);
            tileWidth = blockWidth;

        }
        else
        {
            wholeCols = Math.floor(blockWidth / tileWidth);
            wholeRows = Math.floor(blockHeight / tileHeight);
            extraWidth = blockWidth - (tileWidth * wholeCols);
            extraHeight = blockHeight - (tileHeight * wholeRows);
        }
        
        var wrappedContent = document.createElement("div");
        wrappedContent.style.position = "relative";
        wrappedContent.style.zIndex = "1";
        wrappedContent.style.left = "0px";
        wrappedContent.style.top = "0px";
        if (!isNaN(parseInt(oBlock.style.width)))
        {
            wrappedContent.style.width = "" + blockWidth + "px";
        }
        if (!isNaN(parseInt(oBlock.style.height)))
        {
            wrappedContent.style.height = "" + blockHeight + "px";
        }
        var pngBGFixIsWrappedContentEmpty = true;
        while (oBlock.hasChildNodes())
        {
            if (oBlock.firstChild.nodeType == 3)
            {
                if (RegExp("^ *$").exec(oBlock.firstChild.data) == null)
                {
                    pngBGFixIsWrappedContentEmpty = false;
                }
            }
            else
            {
                pngBGFixIsWrappedContentEmpty = false;
            }
            wrappedContent.appendChild(oBlock.firstChild);
        }
        if (pngBGFixIsWrappedContentEmpty)
        {
            wrappedContent.style.lineHeight = "0px";
        }
        
        var newMarkup = "";
        for (var currentRow = 0; 
             currentRow < wholeRows; 
             currentRow++)
        {
            for (currentCol = 0; 
                 currentCol < wholeCols; 
                 currentCol++)
            {
                newMarkup += "<div style=" +
                        "\"position: absolute; line-height: 0px; " +
                        "width: " + tileWidth + "px; " +
                        "height: " + tileHeight + "px; " +
                        "left:" + currentCol *  tileWidth + "px; " +
                        "top:" + currentRow *  tileHeight + "px; " +
                        "filter:" + filterStyle + 
                        "\" > </div>";
            }
            
            if (extraWidth != 0)
            {
                newMarkup += "<div style=" +
                        "\"position: absolute; line-height: 0px; " +
                        "width: " + extraWidth + "px; " +
                        "height: " + tileHeight + "px; " +
                        "left:" + currentCol *  tileWidth + "px; " +
                        "top:" + currentRow *  tileHeight + "px; " +
                        "filter:" + filterStyle + 
                        "\" > </div>";
            }
        }
        
        if (extraHeight != 0)
        {
            for (currentCol = 0; 
                 currentCol < wholeCols; 
                 currentCol++)
            {
                newMarkup += "<div style=" +
                        "\"position: absolute; line-height: 0px; " +
                        "width: " + tileWidth + "px; " +
                        "height: " + extraHeight + "px; " +
                        "left:" + currentCol *  tileWidth + "px; " +
                        "top:" + currentRow *  tileHeight + "px; " +
                        "filter:" + filterStyle + 
                        "\" > </div>";
            }
            
            if (extraWidth != 0)
            {
                newMarkup += "<div style=" +
                        "\"position: absolute; line-height: 0px; " +
                        "width: " + extraWidth + "px; " +
                        "height: " + extraHeight + "px; " +
                        "left:" + currentCol *  tileWidth + "px; " +
                        "top:" + currentRow *  tileHeight + "px; " +
                        "filter:" + filterStyle + 
                        "\" > </div>";
            }
        }
        oBlock.innerHTML = newMarkup;

        oBlock.appendChild(wrappedContent);
        oBlock.style.background= "";
    }
}

function fixupAllIEPNGBGs()
{
    if (windowsInternetExplorer && (browserVersion < 7))
    {
        try
        {
            var oDivNodes = document.getElementsByTagName('DIV');
            for (var iIndex=0; iIndex<oDivNodes.length; iIndex++)
            {
                var oNode = oDivNodes.item(iIndex);
                if (oNode.currentStyle &&
                    oNode.currentStyle.backgroundImage &&
                    (oNode.currentStyle.backgroundImage.indexOf('url(') != -1) &&
                    (oNode.currentStyle.backgroundImage.indexOf('.png")') != -1))
                {
                    fixupIEPNGBG(oNode);
                }
            }
        }
        catch (e)
        {
        }
    }
}

function getChildOfType(oParent, sNodeName, requestedIndex)
{
    var childrenOfType = oParent.getElementsByTagName(sNodeName);
    return (requestedIndex < childrenOfType.length) ?
           childrenOfType.item(requestedIndex) : null;
}

function getParaDescendants(oAncestor)
{
    var oParaDescendants = new Array();
    var oPotentialParagraphs = oAncestor.getElementsByTagName('DIV');
    for (var iIndex=0; iIndex<oPotentialParagraphs.length; iIndex++)
    {
        var oNode = oPotentialParagraphs.item(iIndex);
        if (oNode.className.lastIndexOf('paragraph') != -1)
        {
            oParaDescendants.push(oNode);
        }
    }
    return oParaDescendants;
}

function onPageLoad()
{
    detectBrowser();
    adjustLineHeightIfTooBig("id1");
    adjustFontSizeIfTooBig("id1");
    adjustLineHeightIfTooBig("id5");
    adjustFontSizeIfTooBig("id5");
    adjustLineHeightIfTooBig("id7");
    adjustFontSizeIfTooBig("id7");
    adjustLineHeightIfTooBig("id9");
    adjustFontSizeIfTooBig("id9");
    adjustLineHeightIfTooBig("id11");
    adjustFontSizeIfTooBig("id11");
    fixupAllIEPNGBGs();
    fixupIEPNG("id2", "Location Shots_files/transparent.gif");
    fixupIEPNG("id3", "Location Shots_files/transparent.gif");
    fixupIEPNG("id4", "Location Shots_files/transparent.gif");
    fixupIEPNG("shapeimage_3_link_0", "Location Shots_files/transparent.gif");
    fixupIEPNG("shapeimage_3_link_1", "Location Shots_files/transparent.gif");
    fixupIEPNG("shapeimage_3", "Location Shots_files/transparent.gif");
    fixupIEPNG("id6", "Location Shots_files/transparent.gif");
    fixupIEPNG("id8", "Location Shots_files/transparent.gif");
    fixupIEPNG("id10", "Location Shots_files/transparent.gif");
    fixupIEPNG("id12", "Location Shots_files/transparent.gif");
    return true;
}

function NBmouseover(index)
{
    var normal = document.getElementById("navbar_"+index+"_normal");
    var rollover = document.getElementById("navbar_"+index+"_rollover");
    if (normal && rollover)
    {
        normal.style.visibility = "hidden";
        rollover.style.visibility = "visible";
    }
    return true;
}

function NBmouseout(index)
{
    var normal = document.getElementById("navbar_"+index+"_normal");
    var rollover = document.getElementById("navbar_"+index+"_rollover");
    if (normal && rollover)
    {
        normal.style.visibility = "visible";
        rollover.style.visibility = "hidden";
    }
    return true;
}

function IMpreload(path, name, areaIndex)
{
    var rolloverName = name+'_rollover_'+areaIndex;
    var rolloverPath = path+'/'+rolloverName+'.png';
    self[rolloverName] = new Image();
    self[rolloverName].src = rolloverPath;

    var linkName = name+'_link_'+areaIndex;
    var linkPath = path+'/'+linkName+'.png';
    self[linkName] = new Image();
    self[linkName].src = linkPath;
    return true;
}

function IMmouseover(name, areaIndex)
{
    var rolloverName = name+'_rollover_'+areaIndex;
    var linkName = name+'_link_'+areaIndex;
    var img  = document.getElementById(linkName);
    if (img)
    {
        img.src = self[rolloverName].src;
    }
    return true;
}

function IMmouseout(name, areaIndex)
{
    var linkName = name+'_link_'+areaIndex;
    var img  = document.getElementById(linkName);
    if (img)
    {
        img.src = self[linkName].src;
    }
    return true;
}

var windowsInternetExplorer = false;
var browserVersion = 0;
function detectBrowser()
{
    windowsInternetExplorer = false;
    var appVersion = navigator.appVersion;
    if ((appVersion.indexOf("MSIE") != -1) &&
        (appVersion.indexOf("Macintosh") == -1))
    {
        var temp = appVersion.split("MSIE");
        browserVersion = parseFloat(temp[1]);
        windowsInternetExplorer = true;
    }
}

var inImgPropertyChanged = false;
function imgPropertyChanged()
{
    if ((window.event.propertyName == "src") && (! inImgPropertyChanged))
    {
        inImgPropertyChanged = true;
        var el = window.event.srcElement;
        if (el.src != smallTransparentGif)
        {
            el.filters.item(0).src = el.src;
            el.src = smallTransparentGif;
        }
        inImgPropertyChanged = false;
    }
}