function init_toggle(start_group) {

         if (start_group) {
                 giveme = start_group;
                 toggling(giveme);
         }

}

function toggling(giveme) {

         if (giveme == 'wohnheim') {
                 id1 = "about";
                 id2 = "position";
                 id3 = "prices";
                 id4 = "rooms";
                 id7 = "kitchen";
                 toggler = document.getElementById(id1);
         }

         if (giveme == 'bewerben') {
                 id5 = "apply";
                 id6 = "rules";
                 toggler = document.getElementById(id5);
         }

         if(toggler.className == 'navitem_closed_1') {
                 document.getElementById(id1).className = "navitem_opened_1";
                 document.getElementById(id2).className = "navitem_opened_1";
                 document.getElementById(id3).className = "navitem_opened_1";
                 document.getElementById(id4).className = "navitem_opened_1";
                 document.getElementById(id7).className = "navitem_opened_1";
         }
         else {
                 if (toggler.className == 'navitem_opened_1') {
                         document.getElementById(id1).className = "navitem_closed_1";
                         document.getElementById(id2).className = "navitem_closed_1";
                         document.getElementById(id3).className = "navitem_closed_1";
                         document.getElementById(id4).className = "navitem_closed_1";
                         document.getElementById(id7).className = "navitem_closed_1"; 
                 }
         }

         if(toggler.className == 'navitem_closed_2') {
                 document.getElementById(id5).className = "navitem_opened_2";
                 document.getElementById(id6).className = "navitem_opened_2";
         }
         else {
                 if (toggler.className == 'navitem_opened_2') {
                         document.getElementById(id5).className = "navitem_closed_2";
                         document.getElementById(id6).className = "navitem_closed_2";
                 }
         }

}