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);