<html>
<head>
<script type="text/javascript" src="http://www.w3school.com.cn/jquery/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#box a").mouseover(function(){
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#box a{ display:block; z-index:1000; width:98px; height:98px;}
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<body>
<div id="box" style="width:100px; height:100px;">
<a href="#"><img src="erwm.png" border="0" width="99" height="99"/></a>
<a href="#"><img src="erwm.png" border="0" width="99" height="99"/></a>
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<html>
<head>
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$(document).ready(function(){
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$(this).css("border","1px solid red");
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<style>
#box a{ display:block; z-index:1000; width:98px; height:98px;}
</style>
</head>
<body>
<div id="box" style="width:100px; height:100px;">
<a href="#"><img src="erwm.png" border="0" width="99" height="99"/></a>
<a href="#"><img src="erwm.png" border="0" width="99" height="99"/></a>
</div>
</body>
</html>
