function ge(e){return document.getElementById(e);}

function loadNav(){
	if ( navigator.userAgent.indexOf("MSIE")==-1 || navigator.userAgent.indexOf("MSIE 7") != -1 ) return;
	var au=ge("about_us");
	au.onmouseover=function(){ ge("about_subnav").style.display="block";};
	au.onmouseover=function(){ ge("about_subnav").style.display="none";};
}