var _imageXML = "/includes/random.xml";
var _secondaryImageXML = "/includes/random_secondary.xml";
function RandomSeed()
{
    var rnd = Math.random().toString();
    return rnd.substr(2, rnd.length - 2);
}
function LoadImage()
{
    var request = new Ajax.Request(
        _imageXML,
        {
            method: "get",
            parameters: "par=" + RandomSeed(),
            onComplete: ImageResponse
        }
    );
}
function LoadSecondaryImage()
{
    var request = new Ajax.Request(
        _secondaryImageXML,
        {
            method: "get",
            parameters: "par=" + RandomSeed(),
            onComplete: SecondaryImageResponse
        }
    );
}
function ImageResponse(xmlRequest)
{
    var xmlDoc = xmlRequest.responseXML;
    var imageTags = xmlDoc.getElementsByTagName("img");
    var imageNumber = Math.round(Math.random() * imageTags.length);
    var img = document.getElementById("homeHeader");
    img.src = imageTags[imageNumber].getAttribute("src");
}
function SecondaryImageResponse(xmlRequest)
{
    var xmlDoc = xmlRequest.responseXML;
    var imageTags = xmlDoc.getElementsByTagName("img");
    var imageNumber = Math.round(Math.random() * imageTags.length);
    var img = document.getElementById("secondaryHeader");
    img.src = imageTags[imageNumber].getAttribute("src");
}