// Ajax comon function
function GetXmlHttpObject(handler) 
{ 
	var objXmlHttp=null 

	if (navigator.userAgent.indexOf("Opera")>=0) 
   { 
    alert("This example doesn't work in Opera") 
    return  
   } 
	
   if (navigator.userAgent.indexOf("MSIE")>=0) 
   { 
	   var strName="Msxml2.XMLHTTP" 
	   if (navigator.appVersion.indexOf("MSIE 5.5")>=0) 
       { 
     	 strName="Microsoft.XMLHTTP" 
       } 
      try 
      { 
		  objXmlHttp=new ActiveXObject(strName) 
		  objXmlHttp.onreadystatechange=handler 
		  return objXmlHttp 
      } 
      catch(e) 
      { 
		  alert("Error. Scripting for ActiveX might be disabled") 
		  return 
      } 
    } 
	
   if (navigator.userAgent.indexOf("Mozilla")>=0) 
   { 
	   objXmlHttp=new XMLHttpRequest() 
	   objXmlHttp.onload=handler 
	   objXmlHttp.onerror=handler 
	   return objXmlHttp 
   } 
}