function sfHover() {
    loadHover("tnavmenubar", "tnhvr");
}

function loadHover(menuID, hoverClass) {
    if (document.getElementById(menuID) != null) {
        var sfEls = document.getElementById(menuID).getElementsByTagName("LI");
	    for (var i=0; i<sfEls.length; i++) {
    		sfEls[i].onmouseover=function()	{
			    this.className+=" " + hoverClass;
		    }
		    sfEls[i].onmouseout=function() {
    			this.className=this.className.replace(new RegExp(" " + hoverClass + "\\b"), "");
		    }
	    }
    }
}