// JavaScript Document
// function to create an XMLHttpClient in a cross-browser manner
function initXMLHttpClient() {
	var xmlhttp;
	try {
	 // Mozilla / Safari / IE7
	 xmlhttp = new XMLHttpRequest();
	} catch (e) {
	   // IE
	   var XMLHTTP_IDS = new Array('MSXML2.XMLHTTP.5.0',
								 'MSXML2.XMLHTTP.4.0',
								 'MSXML2.XMLHTTP.3.0',
								 'MSXML2.XMLHTTP',
								 'Microsoft.XMLHTTP' );
	  var success = false;
	  for (var i=0;i < XMLHTTP_IDS.length && !success; i++) {
		  try {
			   xmlhttp = new ActiveXObject(XMLHTTP_IDS[i]);
				  success = true;
			} catch (e) {}
	  }
	  if (!success) {
		  throw new Error('Unable to create XMLHttpRequest.');
	  }
	}
	return xmlhttp;
}

// function to execute the consult and return to the user screen
function runXMLHttpRequest(query,elementId){
	//Creando la instancia correcta segun el navegador
	var req = initXMLHttpClient();
	req.open('GET',query, true);
	req.onreadystatechange = function() {
		if (req.readyState == 4) {
			   if (req.status == 200) {
					document.getElementById(elementId).innerHTML = req.responseText;
			 } else {
				 alert('Loading Error: ['+req.status+'] '
						  +req.statusText);
			 }
		}
	 }
	req.send(null);	
}