function abrirPag(valor)
	{    
		var url = valor;  
		xmlRequest.open("GET",url,true); 
		xmlRequest.onreadystatechange = mudancaEstado;   
		  
		xmlRequest.send(null);       
		

		
		if (xmlRequest.readyState == 1)
		   {            
		      document.getElementById("mapa").innerHTML = "Carregando...";  
		   }    
		   
		   return url;
	}
	
 function mudancaEstado()
    {    
	     if (xmlRequest.readyState == 4)
		   {        
		       document.getElementById("mapa").innerHTML = xmlRequest.responseText; 
			}
	}