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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
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function getOffset(obj){
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div.style.display = "block";
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div.style.height = parseInt(coords[3]) - parseInt(coords[1]) + "px";
}
function hideBorder(){
document.getElementById("border").style.display = "none";
}
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<body>
<img src="http://www.baidu.com/img/baidu_logo.gif" width="270" height="129" border="0" usemap="#bdMap" id="bd" />
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<div id="border" style="display:none; position:absolute;border:2px solid #FF0000; "></div>
</body>
</html>
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