function sendForm() {
  form = document.getElementById("sendform");
  name    = form.name.value;
  email   = form.email.value;
  message = form.message.value;

  msg = "Wilt u de volgende velden invullen:\n\n";

  if(trim(name)!='' && name!=null && trim(email)!='' && email!=null && trim(message)!='' && message!=null)
  {
	var winl = (screen.width-350)/2;
	var wint = (screen.height-250)/2;

	var mywin = window.open('','_newform','width=350,height=250,top='+wint+',left='+winl+',scrollbars=no,toolbar=no,location=no,status=no,resizable=no,menubar=no');
	mywin.focus();
	
	form.action="http://www.radiodabanga.org/apache2-default/blog/blog_en/wp-content/themes/elements-of-seo/sendform.php";
	form.target = "_newform";
	form.submit();
  }
  else
  {
	if(trim(name)=='')
	  msg += "- Naam\n";
	if(trim(email)=='')
	  msg += "- E-mail\n";
	if(trim(message)=='')
	  msg += "- Message\n";

	alert(msg);
  }
}

function trim(value) {
  value = value.replace(/^\s+/,'');
  value = value.replace(/\s+$/,'');
  return value;
}