var ArrLayer = new Array( "iframecontent");
	var arrPresetLayers = new Array();
	var ie=document.all; var ns4=document.layers;
function showlayer()
	{
	     if (document.all) //ie
	     {
	        for (i=0;i<ArrLayer.length;i++)
	        {
	            document.all[ArrLayer[i]].style.visibility = 'hidden';
	        }
			if(showlayer.arguments.length != 0)
			{
				for (i=0;i<showlayer.arguments.length;i++)
				{
					document.all[showlayer.arguments[i]].style.visibility = 'visible';
				}
						
			}
		  
		 }		
		 
		 
	    else if(document.getElementById) //netscape6
	     {
	     	for (i=0;i<ArrLayer.length;i++)
	        {
	            document.getElementById(ArrLayer[i]).style.visibility = 'hidden';
	        }
			if(showlayer.arguments.length != 0)
			{
				for (i=0;i<showlayer.arguments.length;i++)
				{
					document.getElementById(showlayer.arguments[i]).style.visibility = 'visible';
				}
			}
			
		}  
	     else if (document.layers) //netscape 4 et -
	     {
	        for (i=0;i<ArrLayer.length;i++)
	        {
	            document.layers[ArrLayer[i]].visibility = 'hidden';
	        }
			if(showlayer.arguments.length != 0)
			{
				for (i=0;i<showlayer.arguments.length;i++)
				{
					document.layers[showlayer.arguments[i]].visibility = 'visible';
				}
			}
		}
	}