function activeRoot () {
    if(elmMenu = document.getElementById("topmenu")) {
    
        if (document.getElementsByClassName) {
        	var elmMenuItems = elmMenu.getElementsByClassName("first");
        	if (elmMenuItems.length > 0 && document.location.pathname.length <= 1) {
        		elmMenuItems[0].className += " active";
        	}
        } else {
        	var elmMenuItems = elmMenu.getElementsByTagName("li");
        	if (elmMenuItems.length > 0 && document.location.pathname.length <= 1) {
        	    if (elmMenuItems[0].className == "first") {
            		elmMenuItems[0].className += " active";
            	}
        	}
        }
    }
}

window.onload = activeRoot;