function ChangeImage(sMainImageURL, sLargeImageURL) 
{    
        var i;
        if (document.images) {
            for (i = 0; i < document.images.length; i++) {
                if (document.images[i].name == "MainImageLink")
                    document.images[i].src = sMainImageURL;
            }
        }

        if (document.links) {
            for (i = 0; i < document.links.length; i++) {
                if (document.links[i].name == "MainImage")
                    document.links[i].href = sLargeImageURL;
            }
        }

        /* CR - 26/6/2009 - Does not work in IE7 so need to loop through instead
        if (document.images)
            if (document.images["MainImageLink"])
            document.images["MainImageLink"].src = sMainImageURL;

        if (document.links)
            if (document.links["MainImage"])
            document.links["MainImage"].href = sLargeImageURL;
        */
}