/* Controle zoek knop */
function app_for_key_submit() {
	if (document.app_for_key.k.value == '' || document.app_for_key.k.value == 'Zoeken...' || document.app_for_key.k.value == 'Vul uw zoekwoord in!'){
		document.app_for_key.k.value = 'Vul uw zoekwoord in!'; document.app_for_key.k.style.color = '#FF0000';
	} else {document.app_for_key.submit();}
}