Ajax problem

[Fot]

Hello, first I have a code with ajax and cannot operate the onChange.ALso
it cannot see the picture.

<select name="cs"  onChange="ajaxRequest(this)">

<div id="result"> </div>

function ajaxRequest(){
  var activexmodes=["Msxml2.XMLHTTP", "Microsoft.XMLHTTP"] //activeX versions to check for in IE
  if (window.ActiveXObject){ //Test for support for ActiveXObject in IE first (as XMLHttpRequest in IE7 is broken)
   for (var i=0; i<activexmodes.length; i++){
    try{
     return new ActiveXObject(activexmodes[i])
    }
    catch(e){
     //suppress error
    }
   }
  }
  else if (window.XMLHttpRequest) // if Mozilla, Safari etc
   return new XMLHttpRequest()
  else
   return false
 }

 var mygetrequest=new ajaxRequest()
if (mygetrequest.overrideMimeType)
  mygetrequest.overrideMimeType('text/xml')
 mygetrequest.onreadystatechange=function(){
  if (mygetrequest.readyState==4){
   if (mygetrequest.status==200 || window.location.href.indexOf("http")==-1){
   var xmldata=mygetrequest.responseXML //retrieve result as an XML object
    var rssentries=xmldata.getElementsByTagName("pmdata")
    var output='<ul>'
    for (var i=0; i<rssentries.length; i++){
     output+='<li>'
     output+='<a href="'+rssentries[i].getElementsByTagName('picture')[0].firstChild.nodeValue+'">'
     output+=rssentries[i].getElementsByTagName('name')[0].firstChild.nodeValue+'</a>'
     output+='</li>'
    }
    output+='</ul>'
    document.getElementById("result").innerHTML=output
   }
   else{
    alert("An error has occured making the request")
   }
  }
 }

 mygetrequest.open("GET", "http://outranet.scm.tees.ac.uk/users/u0000700/wes_ica_09_10/ukpm.php", true)
 mygetrequest.send(null)

in php file

<prime_minister>
<pmdata>
<name>
Herbert Henry Asquith
</name>
</pmdata>
<pmdata>
<dates>
 1908-16
</dates>
</pmdata>
<pmdata>
<number>
35
</number>
</pmdata>
<pmdata>
<picture>
http://www.number-10.gov.uk/files/images/OLD%20PMs%20-%20H%20H%20Asquith.jpg
</picture>
</pmdata>
</prime_minister>

[Fot]

Hello, I would like your opinion about my problem.

[AndrewGSW]

<select name="cs"  onChange="ajaxRequest(this)">

You are attempting to supply an argument to your ajaxRequest function, but the function doesn't define any arguments.

Your ajaxRequest function returns an object (or false) which is simply discarded by your onchange event.