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("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);