1 
  2 var request;function getHTTPObject(){try{request=new XMLHttpRequest();}catch(trymicrosoft){try{request=new ActiveXObject("Msxml2.XMLHTTP");}catch(othermicrosoft){try{request=new ActiveXObject("Microsoft.XMLHTTP");}catch(failed){request=false;}}}
  3 if(!request)
  4 alert("Error initializing XMLHttpRequest!");return request;}
  5 function getHTTPObject_old(){var xmlhttp;if(!xmlhttp&&typeof XMLHttpRequest!='undefined'){try{xmlhttp=new XMLHttpRequest();}catch(e){xmlhttp=false;}}
  6 return xmlhttp;}
  7