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)