var preloadedImages = new Array();

function preloadImages(locationFolder) {
    if(document.images) {
            var i, args = preloadImages.arguments; 
            for(i=1; i<args.length; i++) {
                preloadedImages[args[i]]   = new Image(); 
                preloadedImages[args[i]].src   = locationFolder + args[i];
            }
    }
}
function rollOn(imageName) {
     if(document.images)
     document.images[imageName].src = preloadedImages[imageName + "_over.gif"].src;
}
function rollOff(imageName) {
    if(document.images)
     document.images[imageName].src = preloadedImages[imageName + "_normal.gif"].src;
}

function rollDetailsOn(imageName) {
     if(document.images)
     document.images[imageName].src = preloadedImages["moreOver.gif"].src;
}
function rollDetailsOff(imageName) {
    if(document.images)
     document.images[imageName].src = preloadedImages["moreNormal.gif"].src;
}

function rollOver(imageName, imageUrl) {
		if(document.images)
		document.images[imageName].src = preloadedImages[imageUrl].src;
	}