function ctFocus(el){
	if(el.value == 'zoekwoord'){
		el.value = '';
	}
}
function ctLostFocus(el){
	if(el.value == ''){
		el.value = 'zoekwoord';
	}
}
function goToUrl(el){
	if(el.selectedIndex > 0){
		var sel = el[el.selectedIndex];
		var url = 'pagina.php?c=' + sel.value;
		location.href = url;
	}
}