function setOptions(chosen) {
var selbox = document.search.opttwo;
 
selbox.options.length = 0;
if (chosen == "Leiders") {
  selbox.options[selbox.options.length] = new Option('Trefwoord','LeidersTrefwoord');
  selbox.options[selbox.options.length] = new Option('Team','LeidersTeam');
  selbox.options[selbox.options.length] = new Option('Kennisgebied','LeidersKennisgebied');
  selbox.options[selbox.options.length] = new Option('Woonplaats','LeidersWoonplaats');
  selbox.options[selbox.options.length] = new Option('Organisaties','LeidersOrganisaties');
}
if (chosen == "Projecten") {
  selbox.options[selbox.options.length] = new Option('Alle','ProjectenAlle');
  selbox.options[selbox.options.length] = new Option('Team','ProjectenTeam');
  selbox.options[selbox.options.length] = new Option('Categorie','ProjectenCategorie');
}
if (chosen == "Activiteiten") {
  selbox.options[selbox.options.length] = new Option('third choice - option one','threeone');
  selbox.options[selbox.options.length] = new Option('third choice - option two','threetwo');
}
if (chosen == "Teams") {
  selbox.options[selbox.options.length] = new Option('third choice - option one','threeone');
  selbox.options[selbox.options.length] = new Option('third choice - option two','threetwo');
}
}