var sub_base = "/resources/images/";
    var sub_offSuffix = "_off.gif";
    var sub_overSuffix = "_over.gif";
    var sub_onSuffix = "_on.gif";

    var sub_precacheKeys = new Array("botsubmit","topsubmit","bot_clear","top_clear");

    var sub_IMGOFF = "0";
    var sub_IMGOVER = "1";
    var sub_IMGON = "2";

    var sub_precacheImages = new Array();


    if (document.images) {
        for (var i=0; i < sub_precacheKeys.length; i++) {
            sub_precacheImages[sub_precacheKeys[i]+sub_IMGOFF] = new Image();
            sub_precacheImages[sub_precacheKeys[i]+sub_IMGOVER] = new Image();
            sub_precacheImages[sub_precacheKeys[i]+sub_IMGOFF].src = sub_base + sub_precacheKeys[i] + sub_offSuffix;
            sub_precacheImages[sub_precacheKeys[i]+sub_IMGOVER].src = sub_base + sub_precacheKeys[i] + sub_overSuffix;

        }
    }

    // key,status=0/1
    function setSubmitImg()
    {
        if (document.images) {
            for (var i=0; i < setSubmitImg.arguments.length; i+=2) {
                var key = setSubmitImg.arguments[i];
                var status = setSubmitImg.arguments[i+1];
                document.images[key].src = sub_precacheImages[key+status].src;
            }
        }
    }