// JavaScript Document
isNS4 = (document.layers) ? true : false;
isIE4 = (document.all && !document.getElementById) ? true : false;
isIE5 = (document.all && document.getElementById) ? true : false;
isNS6 = (!document.all && document.getElementById) ? true : false;

if (isNS4) {
	var styleProperty = '';
} else {
	var styleProperty = '.style';
}
var timeOn = null;
var elm = null;
			
var menusArray = new Array('menu1','menu2','menu3','menu4','menu5','menu6','menu7','menu8','menu9');


function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		tnav_home_over = newImage("images/tnav_home-over.gif");
		tnav_tests_over = newImage("images/tnav_tests-over.gif");
		tnav_about_over = newImage("images/tnav_about-over.gif");
		tnav_gftcerts_over = newImage("images/tnav_gftcerts-over.gif");
		tnav_rsrcs_over = newImage("images/tnav_rsrcs-over.gif");
		tnav_cntct_over = newImage("images/tnav_cntct-over.gif");	
		bnav_nbli_over = newImage("images/bnav_nbli-over.gif");
		bnav_night_over = newImage("images/bnav_night-over.gif");
		bnav_china_over = newImage("images/bnav_china-over.gif");
		bnav_group_over = newImage("images/bnav_group-over.gif");
		bnav_other_over = newImage("images/bnav_other-over.gif");		
		preloadFlag = true;
	}
}