function showHideLayerSwitch(layerName1, layerName2)
		{
			
		                if (eval(layerRef+'["'+layerName1+'"]'+styleSwitch+'.visibility=="visible"'))
				{
                        hideLayer(layerName1, layerName2);
				}
										
                else
				{
                        showLayer(layerName1, layerName2);
                }
		}			
					
        function showLayer(layerName1)
	{
				if (isNS4)
				{
   					elm = document.layers[layerName1];
				}
				else if (isIE4) 
				{
 		  			elm = document.all[layerName1];
				}
				else if (isIE5 || isNS6) 
				{
				   elm = document.getElementById(layerName1);
				}
				
				
				if (isIE5 || isIE4 || isNS6)
				{
				elm.style.visibility="visible";
				}
				else if (isNS4)
				{
				elm.visibility="visible";
				}
        }	
        
        function hideLayer(layerName1)
		{
				if (isNS4)
				{
   					elm = document.layers[layerName1];
				}
				else if (isIE4) 
				{
 		  			elm = document.all[layerName1];
				}
				else if (isIE5 || isNS6) 
				{
				   elm = document.getElementById(layerName1);
				}
				
				
				if (isIE5 || isIE4 || isNS6)
				{
				elm.style.visibility="hidden";
				}
				else if (isNS4)
				{
				elm.visibility="hidden";
				}
        }	
		
		function hideMenus()
		{

		}
		
		function hideButtonsOver()
		{
				hideLayer('Nav_Home_Over');
				hideLayer('Nav_Download_Over');
				hideLayer('Nav_Tutorial_Over');
				hideLayer('Nav_Account_Over');
				hideLayer('Nav_Support_Over');
				
		}

		function hideButtonsDown()
		{
				hideLayer('Nav_Home_Down');
				hideLayer('Nav_Download_Down');
				hideLayer('Nav_Tutorial_Down');
				hideLayer('Nav_Account_Down');
				hideLayer('Nav_Support_Down');
				
		}