function abrir(valor){
	var url = valor;
	xmlRequest.onreadystatechange = mudancaValor;
	xmlRequest.open("GET",url,true);
	xmlRequest.send(null);
	
	if (xmlRequest.readyState == 1) {
		document.getElementById("carregarImoveis").innerHTML = '<div style="text-align:center; margin:40px;">carregando imóveis...</div>';
	}
}

function mudancaValor(){
	if (xmlRequest.readyState == 4){
		document.getElementById("carregarImoveis").innerHTML = xmlRequest.responseText;
	}
}