var iTop = -80;
        var iClipTop = 170;
        var bUp = true;
        
        function slide() {
            if (bUp) {
                iTop += 4;
                iClipTop -= 4;
                document.getElementById("cart").style.top = iTop+"px";
                document.getElementById("cart").style.clip = "rect(" + iClipTop + "px 129px 600px 0px)";
                if (iTop < 80) {
                    setTimeout("slide();", 40);
                } else {
                    bUp = false;                
                }
            } else {
                iTop -= 4;
                iClipTop += 4;
                document.getElementById("cart").style.top = iTop+"px";
                document.getElementById("cart").style.clip = "rect(" + iClipTop + "px 129px 600px 0px)";
                if (iTop > -80) {
                    setTimeout("slide();", 40);
                } else {
                    bUp = true;
                }
            }
        }