JavaScript实现IE6下非链接元素悬停效果

<!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=utf-8" /> 
<title>无标题文档</title> 
<style> 
#nav li:hover, #nav li.stest { 
  font-weight:700; 
  color:red; 
} 
</style> 
</head> 
 
<body> 
  <ul id="nav"> 
    <li>列表一</li> 
    <li>列表一</li> 
    <li>列表一</li> 
  </ul> 
 
<script type="text/javascript"> 
  var Hover = function(){ 
    var listItem = document.getElementById("nav").getElementsByTagName("li"); 
    for(var i=0;i<listItem.length;i++){ 
      listItem[i].onmouseover = function(){ 
        this.className +=" stest";  
      } 
      listItem[i].onmouseout = function(){ 
        thisthis.className = this.className.replace(/stest\b/, ""); // \b 查找位于单词的开头或结尾的匹配。 
      }  
    }  
  } 
if(window.attachEvent){ 
  window.attachEvent('onload',Hover); 
} 
</script> 
 
</body> 
</html>