// bild_gr
var PROP_act = {};
function change_pics(ca_id,num){
    var elem = document.getElementById("imggr_" + ca_id + "_" + PROP_act[ca_id]);
    elem.className=elem.className.replace(/^(.*)itsme(.*)$/,"$1$2");
    var elem = document.getElementById("gall_" + ca_id + "_" + PROP_act[ca_id]);
    elem.className=elem.className.replace(/^(.*)itsme(.*)$/,"$1$2");
    PROP_act[ca_id]=num;
    document.getElementById("imggr_" + ca_id + "_" + num).className+=' itsme';
    document.getElementById("gall_" + ca_id + "_" + num).className+=' itsme';
}