зверек,
Возможный вариант решения ...
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
body{
height: 1000px;
}
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
jQuery.fn.scrollComplete = function(fn, ms)
{
var timer = null;
this.scroll(function()
{
if (timer)
{
clearTimeout(timer);
}
timer = setTimeout(fn,ms);
});
}
$(window).scrollComplete(function(){alert('тра-та-та')}, 500);
</script>
</head>
<body>
</body>
</html>