function ajaxFunction(a)
{
var xmlhttp;
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {
  // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
  
xmlhttp.onreadystatechange=function()
{

if(xmlhttp.readyState==2)
  {
document.getElementById("r_f").innerHTML='<img src="images1/loader.gif" alt="loading" />';
//setTimeout("ajaxFunction(a)", 2000);
  }

if(xmlhttp.readyState==4)
  {
document.getElementById("r_f").innerHTML=xmlhttp.responseText;
  }
 
}
xmlhttp.open("GET",a,true);
xmlhttp.send(null);

}