function initAjax()
{

  var xmlHttp;
  
  
	  try
	  {
	    // Firefox, Opera 8.0+, Safari
	    xmlHttp = new XMLHttpRequest();
	  }
	  catch (e)
	  {
		    // Internet Explorer
		    try
			{
		      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		    }
		    catch (e)
			{
			      try
			      {
			        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
			      }
			      catch (e)
				  {
			        alert("Your browser does not support AJAX!");
			        return false;
			      }
		    }
	  }
	  return xmlHttp;
}