var xmlhttp;

/************************************************************************************************/

function check_mail(str)
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="check_usuario.php";
url=url+"?q="+str;
url=url+"&tipo=MAIL";
url=url+"&sid="+Math.random();
xmlhttp.onreadystatechange = function () { stateChanged(xmlhttp) };
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged(request) {
	if (request.readyState == 4) {
		if ((request.status >= 200 && request.status < 300) || (request.status == 0)) {
			document.getElementById("test_mail").innerHTML = request.responseText;
			if (request.responseText.match('error'))
				document.getElementById("txt_mail").style.display = 'block';
			else
				document.getElementById("txt_mail").style.display = 'none';
		}
	}
}

/************************************************************************************************/

function check_user(str)
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="check_usuario.php";
url=url+"?q="+str;
url=url+"&tipo=USR";
url=url+"&sid="+Math.random();

xmlhttp.onreadystatechange = function () { cambioEstado(xmlhttp) };
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function cambioEstado(request) {

	if (request.readyState == 4) {
		if ((request.status >= 200 && request.status < 300) || (request.status == 0)) {
			document.getElementById("test_usr").innerHTML = request.responseText;
			if (request.responseText.match('error'))
				document.getElementById("txt_usr").style.display = 'block';
			else
				document.getElementById("txt_usr").style.display = 'none';
		}
	}
}

/************************************************************************************************/

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}