Igbal,
<div id="kvad" style="position: absolute;top:15;width:50px;height:50px;background:#000;color:#FFFFFF"></div>
<script>
var b=document.getElementById("kvad");
var l = 100;
function igb()
{
l+=100;
b.style.top=l+"px";
b.innerHTML = l
if(l<500) {
window.setTimeout(igb,1000);
}}
igb()
</script>