function abrirPag(valor, alvo)
{

	var url = valor; 
	xmlRequest.open("GET",url,true);  
	xmlRequest.onreadystatechange = mudancaEstado;xmlRequest.send(null);
    if (xmlRequest.readyState == 1) {  
//	   document.getElementById('divAjax').innerHTML = "<div align=center><img src='/images/loading.gif'></div>";  
}   
	   return url; 
} 
function mudancaEstado(){  
    if (xmlRequest.readyState == 4){  
	    document.getElementById('divAjax').innerHTML = xmlRequest.responseText;
    }
}
function GetXMLHttp() {  var xmlHttp;  try {  xmlHttp = new XMLHttpRequest();  }  catch(ee) {  try {   xmlHttp = new ActiveXObject("Microsoft.XMLHttp");  }  catch(e) {  try {   xmlHttp = xmlhttp=new ActiveXObject("MSXML2.XMLHttp");  }  catch(e) {  alert("Seu browser não suporta AJAX!");  xmlHttp = false;     }  }  }  return xmlHttp; }  var xmlRequest = GetXMLHttp();