bt_foerderkreis = new Image ();
bt_foerderkreis.src = "images/bt_foerderkreis.jpg";
bt_foerderkreis_hover = new Image ();
bt_foerderkreis_hover.src = "images/bt_foerderkreis_hover.jpg";

bt_aktuelles = new Image ();
bt_aktuelles.src = "images/bt_aktuelles.jpg";
bt_aktuelles_hover = new Image ();
bt_aktuelles_hover.src = "images/bt_aktuelles_hover.jpg";

bt_paedagogik = new Image ();
bt_paedagogik.src = "images/bt_paedagogik.jpg";
bt_paedagogik_hover = new Image ();
bt_paedagogik_hover.src = "images/bt_paedagogik_hover.jpg";

function rollover (a,bild) {
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