1.
<!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">
.rm {height: 110px;margin: 0px;padding: 3px;event:expression(onmouseover = function(){this.style.backgroundColor = '#E9F5FF';},onmouseout = function(){this.style.backgroundColor = '#ffffff';})}
</style>
</head>
<body>
<div class="rm"></div>
</body>
</html>
2.
非ie的话，使用:hover就可以，例如:
<html>
<head>
<style>
#d1:hover {background:#ff0000}
</style>
</head>
<body>
<div id="d1">www.xrss.cn</div>
</body>
</html>
但"伟大的"ie并不支持这样写...
只好通过定义onmouseover事件和onmouseout了,例如:
<div onmouseover="this.style.backgroundcolor='#ff0000'" onmouseout="this.style.backgroundcolor='#ffffff'">
一般来说,我们定义鼠标经过变色,无非是容器里面有链接,一旦遇上循环列表那种大量的链接,设想一下在无数的div,ul,li,tr,td中,有无数的onmouse事件....