ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
ns6 = (document.getElementById)? true:false

if (document.images) {

	asub1 = new Image();
	asub2 = new Image();
	
	asub1.src = "/images/dropnav_press_off.gif";
	asub2.src = "/images/dropnav_leadership_off.gif";
	
	asub1on = new Image();
	asub2on = new Image();
	
	asub1on.src = "/images/dropnav_press_on.gif";
	asub2on.src = "/images/dropnav_leadership_on.gif";
	
	csub1 = new Image();
	csub2 = new Image();
	
	csub1.src = "/images/dropnav_blog_off.gif";
	csub2.src = "/images/dropnav_events_off.gif";
	
	csub1on = new Image();
	csub2on = new Image();
	
	csub1on.src = "/images/dropnav_blog_on.gif";
	csub2on.src = "/images/dropnav_events_on.gif";
	
	}

function chgImg(imgField,newImg) {
	 if (document.images) {
		document[imgField].src = eval(newImg + ".src");
			}
		}		

function show(id) {
	if (ns4) {
		document.layers[id].visibility = "show";
	}
	else if (ie4) {
		document.all[id].style.visibility = "visible";
	} 
	else if (ns6) {
		document.getElementById(id).style.visibility = "visible";
	}
}

function hide(id) {
	if (ns4) {
		document.layers[id].visibility = "hide";
	}
	else if (ie4) {
		document.all[id].style.visibility = "hidden";
	} 
	else if (ns6) {
		document.getElementById(id).style.visibility = "hidden";
	}
}