我想这样。。。。能行吗？

<a href="#" name="pic1" style="position: absolute; left: 0px; top: 0px; clip:rect()"><IMG SRC="images/ss_03.gif" WIDTH=145 HEIGHT=64 border="0"></a><script>
function su()
{
if(document.all.pic1.offsetLeft==5)
{document.all.pic1.style.left=0;
document.all.pic1.style.top=0;
}
else
{
document.all.pic1.style.left=5;
document.all.pic1.style.top=5;
}
setTimeout("su();",500);
}
</script>