function IEHoverPseudo() {

	var navItems = document.getElementById("main").getElementsByTagName("div");;

for (var i=0; i<navItems.length; i++) {
		if(navItems[i].className == "btn") {
			navItems[i].onmouseover=function() { this.className = "btn_on"; }
			navItems[i].onmouseout=function() { this.className = "btn"; }
		}		
	}

}
window.onload = IEHoverPseudo;