function getPageWidth()
	{
	if (ns4) 	{return document.width;}
	if (ie4)	{return document.body.scrollWidth;}
	if (ns6)	{return document.width;}
	}

function getPageHeight()
	{
	if (ns4) 	{return document.height;}
	if (ie4)	{return document.body.scrollHeight}
	if (ns6)	{return document.height;}
	}

function Is() 
	{
	var agent = navigator.userAgent.toLowerCase();
	this.major = parseInt(navigator.appVersion);
	this.minor = parseFloat(navigator.appVersion);
	this.ns = ((agent.indexOf('mozilla')!=-1) && ((agent.indexOf('spoofer')==-1) && (agent.indexOf('compatible') == -1)));
	this.ns2 = (this.ns && (this.major == 3));
	this.ns3 = (this.ns && (this.major == 3));
	this.ns4b = (this.ns && (this.minor < 4.04));
	this.ns4 = (this.ns && (this.major >= 4));
	this.ns6 = (this.ns && (this.major >= 5));
	this.ie = (agent.indexOf("msie") != -1);
	this.ie3 = (this.ie && (this.major == 2));
	this.ie4 = (this.ie && (this.major == 4));
	this.ie5 = (this.ie && (this.major >= 5));
	this.op3 = (agent.indexOf("opera") != -1);
	this.win = (agent.indexOf("win")!=-1);
	this.mac = (agent.indexOf("mac")!=-1);
	this.unix = (agent.indexOf("x11")!=-1);
	}

var is = new Is();

if (is.ns4) {ns4 = true;  ie4 = false; ns6 = false; ie5 = false}
if (is.ie4) {ns4 = false; ie4 = true;  ns6 = false; ie5 = false}
if (is.ns6) {ns4 = false; ie4 = false; ns6 = true;  ie5 = false}
if (is.ie5) {ns4 = false; ie4 = false; ns6 = false; ie5 = true}