【mouse】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.9.1.js'></script>
<script type='text/javascript'>
$(function(){
$("#about").mouseleave(function () {
$(this).css("background", 'transparent url("http://www.w3cschool.cn/style/download.png") no-repeat top left');
});
});
</script>
</head>
<body>
<div id="about">About</div>
</body>
</html>
