function exibelayer(numero)
{
	aux='layer'+numero;
	
	/*for (t=1; t<=2; t++)
	{
		if (t!=numero)
		{
			aux2='layer'+t;
			if(document.layers)	   
			{
				document.layers[aux2].visibility = 'hidden';
			}
			else if(document.getElementById)	  
			{
				var obj = document.getElementById(aux2);
				obj.style.visibility = 'hidden';
			}
			else if(document.all)	
			{
				document.all[aux2].style.visibility = 'hidden';
			}
	
		}
	}*/

	if(document.layers)	   
	{
		document.layers[aux].visibility = 'visible';
	}
	else if(document.getElementById)	  
	{
		var obj = document.getElementById(aux);
		obj.style.visibility = 'visible';
	}
	else if(document.all)	
	{
		document.all[aux].style.visibility = 'visible';
	}
}