//  Set Variables for different browsers
function setVars() {
	ie4 = ((document.all) && (!document.getElementById) && (navigator.userAgent.indexOf("Opera") <= 0)) ? true : false;
	ns4 = (document.layers) ? true : false;
	ie6 = (document.getElementById && (navigator.appName.indexOf("Explorer") > 0) && (navigator.userAgent.indexOf("Opera") <= 0)) ? true : false;
	ns6 = (document.getElementById && (navigator.appName.indexOf("Netscape") > -1)) ? true : false;
	isOpera = (document.getElementById && (navigator.appName.indexOf("Explorer") > 0) && (navigator.userAgent.indexOf("Opera") > 0)) ? true : false;
	ieMac = ((navigator.appName.indexOf("Explorer") > 0) &&  (navigator.platform.indexOf("Mac") > -1)) ? true : false;

	//  Set the values for ie4
	if (ie4) {
		leftEdge = ".pixelLeft";
		topEdge = ".pixelTop";
		itemStart = "";
		itemEnd = ".style";
		screenWidth = "document.body.clientWidth";
		screenHeight = "document.body.clientHeight";
		divShowing = ".visibility";
		hidden = "'hidden'";
		shown = "'visible'";
		contentHeight = "document.body.offsetHeight";
	}

	if (ns4) {
		leftEdge = ".left";
		topEdge = ".top";
		itemStart = "document."
		itemEnd = "";
		screenWidth = "window.innerWidth";
		screenHeight = "window.innerHeight";
		divShowing = ".visibility";
		hidden = "'hide'";
		shown = "'show'";
		contentHeight = "document.height";
			}

	if (ie6) {
		leftEdge = ".left";
		topEdge = ".top";
		itemStart = "document.getElementById(\'";
		itemEnd = "\').style";
		screenWidth = "document.body.clientWidth";
		screenHeight = "document.body.clientHeight";
		divShowing = ".visibility";
		hidden = "'hidden'";
		shown = "'visible'";
		contentHeight = "document.body.scrollHeight";
	}

	if (ns6) {
		leftEdge = ".left";
		topEdge = ".top";
		itemStart = "document.getElementById(\'";
		itemEnd = "\').style";
		screenWidth = "window.innerWidth";
		screenHeight = "window.innerHeight";
		divShowing = ".visibility";
		hidden = "'hidden'";
		shown = "'visible'";
		contentHeight = "document.body.offsetHeight";
	}
	
	if (isOpera) {
		leftEdge = ".left";
		topEdge = ".top";
		itemStart = "document.getElementById(\'";
		itemEnd = "\').style";
		screenWidth = "window.innerWidth";
		screenHeight = "window.innerHeight";
		divShowing = ".visibility";
		hidden = "'hidden'";
		shown = "'visible'";
		contentHeight = "document.body.offsetHeight";
	}
}

function changeHomeTo(thisImage) {
	document.images[thisImage].src = "images/home_nav_" + thisImage + "_on.gif";
}

function changeHomeBack(thisImage) {
	document.images[thisImage].src = "images/home_nav_" + thisImage + "_off.gif";
}

function changeTo(thisImage) {
	document.images[thisImage].src = "images/nav_" + thisImage + "_on.gif";
}

function changeBack(thisImage) {
	document.images[thisImage].src = "images/nav_" + thisImage + "_off.gif";
}