<!--

function checkcontact(form){
  if (form.f_email.value != "" && (form.f_email.value.indexOf('@',0)==-1 || form.f_email.value.indexOf('.',0)==-1))
   { alert("Ongeldig emailadres!"); form.f_email.focus(); return false ;}
  if (form.f_naam.value == "") { alert( "Vul uw naam in!" ); form.f_naam.focus(); return false ;}
  if (form.f_telefoon.value == "") { alert( "Vul uw telefoonnummer in!" ); form.f_telefoon.focus(); return false ;}
  return true ;
}


//-->