// JavaScript Document
function obtenerXHR(){
req = false;
if(window.XMLHttpRequest){
		req= new XMLHttpRequest();
	}else{
		if(ActiveXObject){
		var vectorVersiones = ["MSXML2.XMLHttp.3.0","MSXML2.XMLHttp","Microsoft.XMLHttp" ];
		
		for(var i=0;i<vectorVersiones.length;i++){
				try{
						req=new ActiveXObject(vectorVersiones[i]);
						return req;
				}catch(e){}
				
			}
		}
	}
	return req;
}