【size】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.9.1.js'></script>
<style type='text/css'>
div {
background: red;
width: 100px;
height: 100px;
}
</style>
<script type='text/javascript'>
$(window).load(function(){
$('#foldit').click( function() {
var toggleWidth = $(this).width() == 165 ? "100px" : "165px";
$(this).animate({ width: toggleWidth });
});
});
</script>
</head>
<body>
<div id="foldit"></div>
</body>
</html>
