//ajax
function getxmlhttpobject(handler){ 
   var objxmlhttp=null	
   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 
	  } 
   }
   else
   {
	  objxmlhttp=new xmlhttprequest()
	  objxmlhttp.onload=handler
	  objxmlhttp.onerror=handler 
	  return objxmlhttp
   }
}