利用js改变宽，高等属性
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "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>
<style type="text/css">
#div1{width:200px;height:200px;background:red;}
</style>
<script type="text/javascript">
function toGreen()
{
var oDiv=document.getElementById("div1");
oDiv.style.width="300px";
oDiv.style.height="300px";
oDiv.style.background="green";
}
function toRed()
{
var oDiv=document.getElementById("div1");
oDiv.style.width="200px";
oDiv.style.height="200px";
oDiv.style.background="red";
}
</script>
</head>
<body>
<div id="div1" onmouseover="toGreen()" onmouseout="toRed()"></div>
</body>
</html>
