function popup(mylink, windowname, width, height) {
   if (! window.focus) return true;
   var href;
   if (typeof(mylink) == 'string') href=mylink;
   else href=mylink.href;
   window.open(href, windowname, 'width='+width+',height='+height+',scrollbars=yes');
   return false;
}

function switchMenu(obj) {
	var el = document.getElementById(obj);
	if ( el.style.display != "none" ) {
		el.style.display = 'none';
	}
	else {

		el.style.display = '';
	}
}