stuHover = function() { 
var cssRule; 
var newSelector; 
for (var i = 0; i < document.styleSheets.length; i++) 
   for (var x = 0; x < document.styleSheets[i].rules.length ; x++) 
    { 
    cssRule = document.styleSheets[i].rules[x]; 
    if (cssRule.selectorText.indexOf("LI:hover") != -1) 
    { 
     newSelector = cssRule.selectorText.replace(/LI:hover/gi, "LI.iehover"); 
     document.styleSheets[i].addRule(newSelector , cssRule.style.cssText); 
    } 
   } 
var getElm = document.getElementById("web_menu").getElementsByTagName("LI"); 
for (var i=0; i<getElm.length; i++) { 
   getElm[i].onmouseover=function() { 
    this.className+=" iehover"; 
   } 
   getElm[i].onmouseout=function() { 
    this.className=this.className.replace(new RegExp(" iehover\\b"), ""); 
   } 
} 
} 
if (window.attachEvent) window.attachEvent("onload", stuHover); 