function Checa_Login(email) {
      ajax = testa_ajax();
	  if(ajax) {
		ajax.open("POST", ("ajax_login.php"), true);
				 ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
				 ajax.onreadystatechange = function() {
					if(ajax.readyState == 4 ) {
					   if(ajax.responseXML) {
						  processXML_login(ajax.responseXML);
					   }
					}
				 }
				 params = 'email=' + email;
				 ajax.send(params);
	   }//FECHA IF AJAX
   }
   function processXML_login(obj){
      var dataArray   = obj.getElementsByTagName("resposta");
	  if(dataArray[0].getElementsByTagName("encontrado")[0].firstChild.nodeValue != 1) {
		document.getElementById("aviso_login").style.display = 'block';
		document.getElementById("email_cadastrado").value = '';
		document.getElementById("email_cadastrado").focus();
		document.getElementById("email_cadastrado").value = '';
		document.getElementById("botao_checa_email").disabled = false;
		document.getElementById("botao_checa_email").value = 'Entrar';
		setTimeout("document.getElementById('aviso_login').style.display = 'none'",3000);
	  }
	  else{
		id = dataArray[0].getElementsByTagName("id")[0].firstChild.nodeValue;
		nome = dataArray[0].getElementsByTagName("nome")[0].firstChild.nodeValue;
		window.location = 'insere_manifestacao.php?logado=sim&nome=' + nome + '&id=' + id;
	  }
   }

// FIM AJAX