function animaciya(element, parametr, nachalo, konec, vremya) {
hod=konec-nachalo
element.style[parametr]=nachalo
interval=setInterval(function(){
if(nachalo<konec)
uslovie=parseInt(element.style[parametr])>konec;
else
uslovie=parseInt(element.style[parametr])<konec;
if(nachalo>konec)
element.style[parametr] = parseInt(element.style[parametr])-1;
else
element.style[parametr] = parseInt(element.style[parametr])+1;
if(uslovie)
clearInterval(interval);
},vremya/hod);
}

<style type="text/css">
div {
    background: blue;
    position: absolute;
    width: 100px;
    height: 100px;
}
</style>

<script type="text/javascript">
window.onload = function(){
    var i = 0;
    (function(){
        if(++i <= 200){
           document.getElementsByTagName('div')[0].style.left = i+'px';
           setTimeout(arguments.callee, 10);
        }
        else {
            alert('finished');
        }
    })();
};
</script>
<div></div>