function getInputValues(holderid) {
 holder = document.getElementById(holderid);
 inputs = holder.getElementsByTagName('input');
 selects = holder.getElementsByTagName('select');
 textareas = holder.getElementsByTagName('textarea');
 i = 0;
 querystring = '';
 while (i < inputs.length) { 
  t_input = inputs[i];
  tv = t_input.value;
  tn = t_input.name;
  tt = t_input.type;
  if (tt == 'radio') {
   if (t_input.checked == true) { querystring = querystring + tn + '=' + tv + '&';}
  } else if (tt == 'checkbox') {
    if (t_input.checked == true) { querystring = querystring + tn + '=' + tv + '&';}
  } else {
   querystring = querystring + tn + '=' + tv + '&'; }
  i++;
 }
 i=0;
 while (i < selects.length) { 
  t_input = selects[i];
  tv = t_input.value;
  tn = t_input.name;
  querystring = querystring + tn + '=' + tv + '&';
  i++;
 }
 i=0;
 while (i < textareas.length) { 
  t_input = textareas[i];
  tv = t_input.value;
  tn = t_input.name;
  querystring = querystring + tn + '=' + tv + '&';
  i++;
 }
 return querystring;
}
addFriend = function addFriend(vrienden) {
 new Ajax.Updater('tellafriend', '/mailfriend',{parameters:'vrienden=' + vrienden + '&' + getInputValues('tellafriend'), evalScripts:true} );
}
function doFriendSubmit() {
 form = $('tfriendform');
 if (checkMfriend() == true) { form.submit(); }
}