//Sample
	//Params to pass Name of the layer and the array of the layer
	//<a href="#" onmouseover="layer_visible('Layer1',0)" OnMouseOut="layer_invisible('Layer1',0)">Test2 </a>
	isNS4 = (document.layers) ? true : false;
	isIE4 = (document.all && !document.getElementById) ? true : false;
	isIE5 = (document.all && document.getElementById) ? true : false;
	isNS6 = (!document.all && document.getElementById) ? true : false;
	
	sId = window.setTimeout("CheckLayers();",100);
	
	function OpenLayerNav(Name)
	{
	   var LayerArray = new Array('Layer1','Layer2','Layer3','Layer4');
	   
	   window.clearTimeout(sId);
	   for(var i=0; i < LayerArray.length;i++)
	   {//alert(i);
		if (isIE4)
		{
			if(LayerArray[i]==Name)
			{
				document.all[LayerArray[i]].style.visibility = "visible";
			}
			else if(LayerArray[i]!=Name)
			{
				document.all[LayerArray[i]].style.visibility = "hidden";
			}
			
		}
		if (isNS4)
		{
		   	if(LayerArray[i]==Name)
		   	{
		   		document.layers[LayerArray[i]].visibility = "show";
		   	}
			else if (LayerArray[i]!=Name){
				document.layers[LayerArray[i]].visibility = "hide";
			}
			//document.layers["Layer1"].visibility="show";
		}
		
		if (isIE5 || isNS6) 
		{
		   	  if(LayerArray[i]==Name)
		      {	elm = document.getElementById(LayerArray[i]);
		   		elm.style.visibility = "visible";				
			  }
			  else if(LayerArray[i]!=Name)
			  { elm = document.getElementById(LayerArray[i]);
		   		elm.style.visibility = "hidden";
			  }
		

		}
			
	   }
	   if(Name!='')
	   {sId = window.setTimeout("CheckLayers();",2500);}
	}	
	
	function CheckLayers()
	{
		CloseLayerNav('');
	}

	function CloseLayerNav()
	{
	if (isIE4)
		{
			document.all["Layer1"].style.visibility = "hidden";
			document.all["Layer2"].style.visibility = "hidden";
			document.all["Layer3"].style.visibility = "hidden";
			document.all["Layer4"].style.visibility = "hidden";
		}
			
		if (isNS4)
		{
		   	document.layers["Layer1"].visibility = "hide";
		   	document.layers["Layer2"].visibility = "hide";
		   	document.layers["Layer3"].visibility = "hide";
		   	document.layers["Layer4"].visibility = "hide";
		}
		
		if (isIE5 || isNS6) 
		{
		   	   elm = document.getElementById("Layer1");
		   	   elm.style.visibility = "hidden";
		   	   elm = document.getElementById("Layer2");
		   	   elm.style.visibility = "hidden";
		   	   elm = document.getElementById("Layer3");
		   	   elm.style.visibility = "hidden";
		   	   elm = document.getElementById("Layer4");
		   	   elm.style.visibility = "hidden";
		   		
		}

						
		elm = document.getElementById("Layer1");
		elm.style.visibility = "hidden";	
						
		elm = document.getElementById("Layer2");
		elm.style.visibility = "hidden";	
		
		elm = document.getElementById("Layer3");
		elm.style.visibility = "hidden";
		
		elm = document.getElementById("Layer4");
		elm.style.visibility = "hidden";
		
		}