function submitform()
{
    
  if (document.joinform.ema.value == "") {
    alert('Please must provide an e-mail address');
  } else {
  document.joinform.submit();
  }
}

function openwindow(URL) {
  window.open(URL,'window','resizable=1, menubar=1,scrollbars=1, width=600, height=400');
}


function openPicWindow(URL) {
  var numberOfPics = 9;
  window.open(URL+"&np="+numberOfPics,'window','resizable=1, menubar=1,scrollbars=1, width=600, height=500');
}


function openLinkWindow(URL) {

  window.open(URL,'window','resizable=1, menubar=1,scrollbars=1, width=800, height=600');
}