function Inint_AJAX() {



   try { return new ActiveXObject("Msxml2.XMLHTTP");  } catch(e) {} //IE   



   try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {} //IE



   try { return new XMLHttpRequest();          } catch(e) {} //Native Javascript



   alert("XMLHttpRequest not supported");



   return null;



};