var agt 		= navigator.userAgent.toLowerCase(); 
	var is_major 	= parseInt(navigator.appVersion); 
	var is_minor 	= parseFloat(navigator.appVersion); 
	var is_nav  	= ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) && (agt.indexOf('webtv')==-1)); 
	var ns4 		= (is_nav && (is_major == 4)); 
	var ns6 		= (is_nav && (is_major >= 5)); 
	var is_ie 		= (agt.indexOf("msie") != -1); 
	var newie4 		= (is_ie  && (is_major == 4) && (agt.indexOf("msie 5.0")==-1)); 
	var newie5 		= (is_ie && (is_major >= 4));
	
	var displayedLayer = ""

	
function ShowLayer(id) {

	if (displayedLayer != 0) {

		if(ns4) document.layers[displayedLayer].visibility = 'hide';
		if(ns6) document.getElementById(displayedLayer).style.visibility = 'hidden';
		if(newie4 || newie5) document.all[displayedLayer].style.visibility = 'hidden';
	}

	if(ns4) document.layers[id].visibility = 'show';
	if(ns6) document.getElementById(id).style.visibility = 'visible';
	if(newie4 || newie5) document.all[id].style.visibility = 'visible';
	
	displayedLayer=id
}

		
function HideLayer(id) {
	if(ns4) document.layers[id].visibility = 'hide';
	if(ns6) document.getElementById(id).style.visibility = 'hidden';
	if(newie4 || newie5) document.all[id].style.visibility = 'hidden';
}