// JavaScript Document
var http = getHTTPObject(); // We create the HTTP Object

function handleHttpResponse() {	
var ele1=document.getElementById('ele1');
  if (http.readyState == 4)   {
    if (http.responseText.indexOf('invalid') == -1)	 {
		ele1.innerHTML = http.responseText;
    }
  }
}

function f_change(value) {
var val = value;
var url = "get_categories.php?active="+val; // The server-side script
		if (http){
			http.open("post", url , true);
			http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			http.onreadystatechange = handleHttpResponse;
			http.send(null);
		}
}



function getHTTPObject() {
var xmlhttp;
if(window.XMLHttpRequest){
   //for IE7, Mozilla, Safari, etc: use native object
   var xmlhttp = new XMLHttpRequest();
}
else if(window.ActiveXObject){
   //use ActiveX control for IE5.x and IE6
   var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); 
   }

  return xmlhttp;
}