[monolithed]

<script src="http://code.jquery.com/jquery-latest.min.js"></script>

<style type="text/css">
div {
    position: absolute;
    background: red;
    top: 50px;
    left: 10px;
    width: 50px;
    height: 50px;
}
</style>


<input type="button" value="start" />
<div></div>

<script type="text/javascript">
$('input').click(function(){
    $('div').each(function(){
        $(this).is(':animated') ? $(this).stop() : $(this).animate({left: '+=400px'}, 1000);
    });
});
</script>