function checkform() {
	document.getElementById('submitb').value = "Bezig met reserveren...";
	document.getElementById('submitb').disabled = true;
	if (document.getElementById('naam').value.length > 0) { 
		return true;
	 }
	else { 
	  alert('U heeft geen naam ingevuld. Zonder naam kunt u niet reserveren.');
  	  document.getElementById('submitb').disabled = false;
	  document.getElementById('submitb').value = "RESERVEER NU";
    return false;
	 } 
} 

function gettimes(fid) { 
  document.getElementById('aantal').disabled = true;
  AjaxRequest.post ( {
    'url':'inc/gettimes.inc.php?id='+fid,
    'onLoading':function() { document.getElementById('time').innerHTML = 'Bezig met ophalen tijden...'; },
    'onSuccess':function(req) { document.getElementById('time').innerHTML=req.responseText; }
   } ); 
 }
 
 
function gettickets(aid) { 
  AjaxRequest.post ( {
    'url':'inc/gettickets.inc.php?aid='+aid,
    'onSuccess':function(req) { 
			   document.getElementById('aantal').innerHTML=req.responseText;
			   document.getElementById('aantal').disabled = false;
			}
   } ); 
 }
 
  function EnterPressed(e) {
    var characterCode
    if (e && e.which){           // NN4 specific code
      e = e
      characterCode = e.which
     }
    else {
      e = event
      characterCode = e.keyCode // IE specific code
     }
    if (characterCode == 13)
	  return true;// Enter key is 13
    else
	  return false
   }

 enterAsTab = function(f, a){
    addEvent(f, "keypress", function(e){
        var l, i, f, j, o = e.target;
        if(e.key == 13 && (a || !/textarea|select/i.test(o.type))){
            for(i = l = (f = o.form.elements).length; f[--i] != o;);
            for(j = i; (j = (j + 1) % l) != i && (!f[j].type || f[j].disabled || f[j].readOnly || f[j].type.toLowerCase() == "hidden"););
            e.preventDefault(), j != i && f[j].focus();
        }
    });
};