var NS4 = (document.layers) ? 1 : 0;
var IE4 = (document.all) ? 1 : 0;
var DOM = (document.getElementById) ? 1 : 0;

function checkBrowser(){
	this.ver = navigator.appVersion;
	this.dom = document.getElementById?1:0;
	this.ie6 = (this.ver.indexOf("MSIE 6")>-1 && this.dom)?1:0;
	this.ie55 = (this.ver.indexOf("MSIE 5.5")>-1 && this.dom)?1:0;
	this.ie5 = (this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.ie55)?1:0;
	this.ie4 = (document.all && !this.dom) ? 1:0;
	this.ns6 = (this.dom && parseInt(this.ver) >= 5 && this.ver.indexOf("Gecko")>-1) ? 1:0;
	this.ns5 = (this.dom && parseInt(this.ver) >= 5 && !this.ns6) ? 1:0;
	this.ns4 = (document.layers) ? 1:0;
	this.bw  = (this.ie5 || this.ie4 || this.ns4 || this.ns5 || this.ie55 || this.ie6);
	this.os  = (this.ver.indexOf("Macintosh")>-1)? "mac":"pc";
	this.ie  = (this.ie5 || this.ie4 || this.ie55 || this.ie6);
	this.ns  = (this.ns4 || this.ns5 || this.ns6);
	this.client = (!this.ns4) ? "ie" : "ns";
	return this;
}

var is = new checkBrowser();

function NSdMenu(mnum)
{
	var menuname = "Menu"+mnum;
	if (NS4) {
		document.layers[menuname].visibility = "show";
	} 
}

function setY (mnum, evnt)
{
	var menuname = "Menu"+mnum;
	var yy;
	if (NS4) {
		yy = evnt.target.y;
		document.layers[menuname].top = yy;
	} else if(IE4) {
		yy = window.event.y - window.event.offsetY - 2 + document.body.scrollTop;
		document.all[menuname].style.top = yy;
	} else {
		yy = evnt.target.y;
		document.getElementById(menuname).style.top = yy;
	};
//	alert (yy);
	dMenu(mnum,"over");
};

function dMenu(mnum, m)
{
	var menuname = "Menu"+mnum;

	if (m=="over") {
		if (NS4) {
			document.layers[menuname].visibility = "show";
		} else if(IE4) {
			document.all[menuname].style.visibility = "visible";
		} else {
			document.getElementById(menuname).style.visibility = "visible";
		}

	} else if (m=="out") {
		if (NS4) {
			document.layers[menuname].visibility = "hide";
		} else if(IE4) {
			document.all[menuname].style.visibility = "hidden";
		} else {
			document.getElementById(menuname).style.visibility = "hidden";
		}
	}
}

function topMenu(mnum, m)
{
	var menuname = "tMenu"+mnum;

	if (m=="over") {
		if (NS4) {
			document.layers[menuname].visibility = "show";
		} else if(IE4) {
			document.all[menuname].style.visibility = "visible";
		} else {
			document.getElementById(menuname).style.visibility = "visible";
		}

	} else if (m=="out") {
		if (NS4) {
			document.layers[menuname].visibility = "hide";
		} else if(IE4) {
			document.all[menuname].style.visibility = "hidden";
		} else {
			document.getElementById(menuname).style.visibility = "hidden";
		}
	}
}