var ie = (document.all) ? true : false;
var ns = (document.layers) ? true : false;
var dom = (!document.all && document.getElementById) ? true : false;



//nav
preload('nHome_on','images/nav/home_on.jpg');
preload('nHome_off','images/nav/home_off.jpg');
preload('nAbout_on','images/nav/about_on.jpg');
preload('nAbout_off','images/nav/about_off.jpg');
preload('nContact_on','images/nav/contact_on.jpg');
preload('nContact_off','images/nav/contact_off.jpg');
preload('nDisclaimer_on','images/nav/disclaimer_on.jpg');
preload('nDisclaimer_off','images/nav/disclaimer_off.jpg');


function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj+' = new Image()')
		eval(imgObj+'.src = "'+imgSrc+'"')
	}
}
function chgImg(imgField,newImg) {
	if (ns) {eval('document.images[imgField].src = '+newImg+'.src')}
	if (ie) {document[imgField].src = eval(newImg+'.src')}
	if (dom) {document.images[imgField].src = eval(newImg+'.src');}
}
function popEvent(winurl){
	window.open(winurl,"Event","height=650,width=700,menubar=0,resizeable=0,location=0,scrollbars=1,status=0,titlebar=0,toolbar=0");
}