function registreren(wat) {
 var ajaxRequest;
 try
 {
  ajaxRequest = new XMLHttpRequest();
 }
 catch (e)
 {
  try
  {
   ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
  }
  catch (e)
  {
   try
   {
    ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
   }
   catch (e)
   {
    alert("Your browser broke!");
    return false;
   }
  }
 }
 ajaxRequest.onreadystatechange = function()
 {
  if(ajaxRequest.readyState == 4)
  {
   if(ajaxRequest.responseText=='OK!')
   {
    document.getElementById(wat).className='registerOK';
   }else{
    document.getElementById(wat).className='registerNOTOK';
   }
   document.getElementById(wat+'_').innerHTML=ajaxRequest.responseText;
   registerme();
  }
 }
 var queryString = "http://www.klen.nl/beta/includes/register.php?" + wat + "=" + document.getElementById(wat).value;
 ajaxRequest.open("GET", queryString, true);
 ajaxRequest.send(null);
}