function validEmail(theEntry) {
		  badEntry = false
		  invalidChars = " /:,;"     
		  if (theEntry == "") { 
		    badEntry = true
		  }
		  for (i=0; i < 5; i++)  {
		    badChar = invalidChars.charAt(i)
		    if (theEntry.indexOf(badChar,0) > -1) {
		      badEntry = true
		    }
		  }  
		  atsignLoc = theEntry.indexOf("@",1)
		  if (atsignLoc == -1) {
		    badEntry = true
		  }     
		  if (theEntry.indexOf("@",atsignLoc+1) > -1) {
		    badEntry = true
		  }
		  dotLoc = theEntry.indexOf(".",atsignLoc)
		  if (dotLoc == -1) {
		    badEntry = true
		  }
		  if (dotLoc+3 > theEntry.length) {
		    badEntry = true
		  }
		  return badEntry
		}

function ValidateForm(frm) {
  var oFocusItem = null; 
  var content = "";
  validity = true;
  if (frm.Voornaam.value == "") {
    content = content + "- Voornaam\n";
    validity = false;
  }
  if (frm.Achternaam.value == "") {
    content = content + "- Achternaam\n";
    validity = false;
  }
  if (frm.Geboortedatum.value == "") {
    content = content + "- Geboortedatum\n";
    validity = false;
  }
  if (frm.Geslacht.value == "") {
    content = content + "- Geslacht\n";
    validity = false;
  }
  if (frm.Adres.value == "") {
    content = content + "- Adres\n";
    validity = false;
  }
  if (frm.Postcode.value == "") {
    content = content + "- Postcode\n";
    validity = false;
  }
  if (frm.Plaats.value == "") {
    content = content + "- Plaats\n";
    validity = false;
  }
  if (validEmail(frm.Email.value)) {
    content = content + "- E-mail\n";
    validity = false;
  }
  if (frm.Telefoonnummer.value == "") {
    content = content + "- Telefoonnummer\n";
    validity = false;
  }  
  
  if (content == ""){
    if (frm.Gewenste.options[frm.Gewenste.selectedIndex].value == "empty"){
      content = "selecteer uw gewenste item";
      validity = false;
    }
  } else {
    content = "Vul a.u.b. de volgende velden in:\n\n" + content;
  }
  if (! validity) alert(content);
  return validity;
}