var divDestino = '';

var url = '';

function criarXMLHttpRequest() {
   try{ return new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){}
   try{ return new ActiveXObject("Microsoft.XMLHTTP"); }catch(e){}
   try{ return new XMLHttpRequest(); }catch(e){}
   alert("XMLHttpRequest não é suportado!");
   return null;
}

var HttpRequest = criarXMLHttpRequest();

function AbrirPagina()
{
	Carregando();
	HttpRequest.open("GET",url,true);
	HttpRequest.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
    HttpRequest.onreadystatechange = TestaAAltarecaoDoEstado;
    HttpRequest.send(null);	
}

function TestaAAltarecaoDoEstado()
{
	if(HttpRequest.readyState!=4){return;}
	window.document.getElementById(divDestino).innerHTML = HttpRequest.responseText;	
}

function Carregando()
{
	window.document.getElementById(divDestino).innerHTML = "<img src='/imagens/carregando.gif'>";
}