new Ajax.Request( pageUrl + "/imgpreload",
    {
    method: 'get',
    onSuccess: function(transport)
        {
        imagePath = pageUrl + "/css/images/";
        eval(transport.responseText);
        var imagePreloadArray = new Array();
        for(i=0 ; i < imageList.length ; i++)
            {
            imagePreloadArray[i] = new Image();
            imagePreloadArray[i].src = imagePath + imageList[i];
            }
        }
    }
)