function ajaxRequest(url,target,param) {
   var AJAX = null;      
   if (window.XMLHttpRequest) {                 
      AJAX=new XMLHttpRequest();                  
   } else {                                 
      AJAX=new ActiveXObject("Microsoft.XMLHTTP");
   }                                               
   if (AJAX==null) {    
      alert("Your browser doesn't support AJAX.");  				
      return false                                  
   }
   else{	
   
   document.getElementById(target).innerHTML='<img src="functions/ajax-loader.gif" />';
   
   AJAX.open("POST",url,true);
   AJAX.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
   AJAX.onreadystatechange = function() {
      if (AJAX.readyState==4 || AJAX.readyState=="complete") {
         document.getElementById(target).innerHTML=AJAX.responseText;
      }
   }
   }
   AJAX.send(param); 
}