function getXMLHttp ()    {

	var XMLHttp = null;

	if ( window.XMLHttpRequest )    {

		try  {
			XMLHttp = new XMLHttpRequest ();
		} 
		catch (e)  {  }
	}  
	else  if ( window.ActiveXObject )  {

		try  {
			XMLHttp = new ActiveXObject ("Msxml2.XMLHTTP");
		} 
		catch (e)  {

			try  {
				XMLHttp = new ActiveXObject ("Microsoft.XMLHTTP");	
			}
			catch (e)  {  }
		}
	}
	return XMLHttp;
}