function detect()
{
framesetpage="http://www.zoekplaatjes.nl/index1.html";
thispage=window.location.href;
if (thispage.indexOf('://')<0) {thispage="://"+thispage;};
prefix=thispage.substring(0,thispage.lastIndexOf('://'));
suffix=thispage.substring(thispage.lastIndexOf('://')+3,thispage.length);
// alert('the subpage is:['+prefix+']['+suffix+']');
if (parent.location.href==window.location.href) {parent.location.href=framesetpage+"?"+prefix+"&&&"+suffix};
}

function openNewWindow(url) {
window.open(url,"",'resizable=1,scrollbars=1,left=0,top=0');
}

  var submitting = false;

  function checkForm(form)
  {
    if(form.name.value == "") {
      alert("Vul alstublieft uw naam in");
      form.name.focus();
      return false;
    }
    if(form.signer_email.value == "") {
      alert("Vul alstublieft uw e-mailadres in - dit zal niet getoond worden op deze pagina");
      form.signer_email.focus();
      return false;
    }
    if(form.message.value == "") {
      alert("Vul alstublieft het veld opmerkingen in");
      form.message.focus();
      return false;
    }
    return true;
  }

function launchCenter(url, name) {
    var str = "left=1" + ",screenX=1";
    str += ",top=1" + ",screenY=1" + ",scrollbars=1,resizable";

    if (window.screen) {
    var ah = screen.availHeight - 30;
    var aw = screen.availWidth - 10;

    str += ",height=" + ah;
    str += ",width=" + 300;
  }
    else { str += ",height=900,width=300,resizable"; 
 } 
    return window.open(url, name, str);
}