function ieHover() {
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", ieHover);