function CrossXHR() 
{

var xmlhttp=false;
 try {
  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
 } catch (e) {
  try {
   xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  } catch (E) {
   xmlhttp = false;
  }
 }

if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
	try {
		xmlhttp = new XMLHttpRequest();
	} catch (e) {
		xmlhttp=false;
	}
}
if (!xmlhttp && window.createRequest) {
	try {
		xmlhttp = window.createRequest();
	} catch (e) {
		xmlhttp=false;
	}
}
 return xmlhttp;
}

function ObtenerCompania() 
{
	var cellnumber;
	var myurl;
	var super_object;
	cellnumber=document.getElementById("cellnum").value;	
 super_object=CrossXHR();
 myurl = "/etc/?c=" + cellnumber;
 document.getElementById("respuesta").innerHTML = "<p>.... buscando su respuesta ... </p>";
 super_object.open("GET", myurl , true);	
 super_object.onreadystatechange=function() {
  if (super_object.readyState==4) {
//   alert(super_object.responseText)
   document.getElementById("respuesta").innerHTML = super_object.responseText;   
  }
 }
 super_object.send(null)	
 return true;
}

function checkEnter(e)
{ 
var characterCode;

if(e && e.which){ 
e = e
characterCode = e.which
}
else{
e = event
characterCode = e.keyCode 
}
if(characterCode == 13){ 
ObtenerCompania();
return false 
}
else{
return true 
}

}