function getElement( id ) 
{
  if( document.getElementById ) 
  {
    return document.getElementById(id);
  }
  else 
  {
    if( document.all )
    {
      return document.all[id];
    }
    else 
    {
      if( document.layers )
      {
        return document[id];
      }
    }
  }
}

function uitvoeringRefresh( page ) {
  var uitvoering = getElement('uitvoering');
  
  window.location.href = "index.php?page=" + page + "&uitvoering=" + uitvoering.value;    
}

function betalingRefresh() {
  var betaling = getElement('betaling');
  
  window.location.href = "index.php?page=winkelwagentje&betaling=" + betaling.value;
}

function checkPlaatjeUploaden()
{
  var foto = getElement('foto');

  if( foto.value == '' )
  {
    showPopup('geen_foto');
    return false;
  }
  
  var substrFoto = foto.value.split('.');
  var lastIndex = substrFoto.length - 1;
  var extension = substrFoto[lastIndex].toLowerCase();
  
  if( extension != 'jpg' &&
      extension != 'jpeg' )
  {
    showPopup('verkeerde_foto');
    return false;
  }
  
  showPopup('foto_uploaden');
  setTimeout('getElement("loadingAnimation").src = "images/loadingAnimation.gif"', 200);

  return true;
}