Professional dropdown menu navigation

* Credits: Stu Nicholls */
/* URL: http://www.stunicholls.com/menu/pro_dropdown_2/stuHover.js */

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") >= 0)
 {
 newSelector = cssRule.selectorText.replace(/LI:hover/gi, "LI.iehover");
 document.styleSheets[i].addRule(newSelector , cssRule.style.cssText);
 }
 }
 var getElm = document.getElementById("nav").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);