if (document.images)
{
  menupic1 = new Image(49,26);
  menupic1.src = 'img/menuitem_start_high.gif';
  menupic2 = new Image(50,26);
  menupic2.src = 'img/menuitem_visie_high.gif';
  menupic3 = new Image(103,26);
  menupic3.src = 'img/menuitem_rondleiding_high.gif';
  menupic4 = new Image(105,26);
  menupic4.src = 'img/menuitem_opleidingen_high.gif';
  menupic5 = new Image(118,26);
  menupic5.src = 'img/menuitem_zorgstructuur_high.gif';
  menupic6 = new Image(69,26);
  menupic6.src = 'img/menuitem_vakken_high.gif';
  menupic7 = new Image(97,26);
  menupic7.src = 'img/menuitem_aanmelden_high.gif';
  menupic8 = new Image(169,26);
  menupic8.src = 'img/menuitem_lestijden_high.gif';
  menupic9 = new Image(68,26);
  menupic9.src = 'img/menuitem_agenda_high.gif';
  menupic10 = new Image(67,26);
  menupic10.src = 'img/menuitem_nieuws_high.gif';
  menupic11 = new Image(68,26);
  menupic11.src = 'img/menuitem_contact_high.gif';
  menupic12 = new Image(74,12);
  menupic12.src = 'img/bollink_weekrooster_normaal.gif';
  menupic14 = new Image(71,15);
  menupic14.src = 'img/bollink_jaarrooster_normaal.gif';
  menupic16 = new Image(62,27);
  menupic16.src = 'img/bollink_schoolgids_normaal.gif';
  menupic17 = new Image(43,14);
  menupic17.src = 'img/bollink_teletop_normaal.gif';
}

function changeMenuImage(obj, effect)
{
  obj.src = obj.src.substr(0, obj.src.lastIndexOf('_')) + '_' + effect + '.gif';
}