Untitled

<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $("button").click(function(){
    $("div").animate({height:300,width:300,opacity:.5},"slow");

  });
});
</script>
</head>

<body>
<button>Start Animation</button>
<br /><br />
<div style="background:#98bf21;height:100px;width:100px;position:relative">sdsdf
</div>
</body>
</html>