function createRequestObject(){
	var request_o; //declare the variable to hold the object.
	var browser = navigator.appName; //find the browser name
	if(browser == "Microsoft Internet Explorer"){
		/* Create the object using MSIE's method */
		request_o = new ActiveXObject("Microsoft.XMLHTTP");
	}else{
		/* Create the object using other browser's method */
		request_o = new XMLHttpRequest();
	}
	return request_o; //return the object
}

/* The variable http will hold our new XMLHttpRequest object. */
var http = createRequestObject(); 

function expandEzone(id) {
   http.open('get', 'pc.php?action=expandezone&id='+id);
   http.onreadystatechange = function() {
      if(http.readyState == 4) {
         var response = http.responseText;
         document.getElementById('cat_'+id).innerHTML = response;
      }
   }
   http.send(null);
}

function expandDealer(id) {
   http.open('get', 'pc.php?action=expanddealer&id='+id);
   http.onreadystatechange = function() {
      if(http.readyState == 4) {
         var response = http.responseText;
         document.getElementById('cat_'+id).innerHTML = response;
      }
   }
   http.send(null);
}