Problem dropdown menu

I´m a Javascript beginner and found a script for a drop down menu. But I get an error message for the script in Internet Explorer 8. It is something on row 5.
Could someone please advice me?
Here´s the script:

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(” iehoverb”), “”);
}
}
}
if (window.attachEvent) window.attachEvent(“onload”, stuHover);

Also in #JavaScript _↴