function checkContact(form){
 if(form.naam.value != "" && form.email.value != "" && form.bericht.value != "" && form.antispam.value != ""){
  if(form.antispam.value == "g7nn8"){
   return true;
  }
  else{
   alert("U dient de letter- en cijfercombinatie correct te herhalen.");
   return false;
  }
 }
 else{
  alert("Gelieve alle velden in te vullen.");
  return false;
 }
}