// JavaScript Document
 var XMLHttpRequestObject = getAJAX();


 function getAJAX(){
	var XMLHttpRequestObject = false;
 	if(window.XMLHttpRequest) {
 		XMLHttpRequestObject = new XMLHttpRequest();
 	} else {
 		try {
 			XMLHttpRequestObject = new ActiveXObject("MSXML2.XMLHTTP");
 		} catch (exception1) {
 			try {
 				XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
 			} catch (exception2) {
 				XMLHttpRequestObject = false;
 			}
 		}
 	}	
	return XMLHttpRequestObject; 
 }
 
 function carga(archivo, id, param){
	if (XMLHttpRequestObject) {
		var obj=document.getElementById(id);
		if(param != '')
			param='&'+param;
		XMLHttpRequestObject.open("GET",archivo+'?random='+Math.random()+param);
		XMLHttpRequestObject.onreadystatechange = function () {
	 		if (XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200) {
	 			obj.innerHTML = XMLHttpRequestObject.responseText;
		 	} 	
		};
		XMLHttpRequestObject.send(null);
	}	
	 
 }