function update_image(event) {
    var trigger = this;
    var container = $('picture-it');
    var content = this.href;
    var inactiveLinks = $$('.slide-content a');

    inactiveLinks.invoke('removeClassName', 'active');
    trigger.addClassName('active');
    
    new Ajax.Updater(container, content);
}

function change_SlideInfo(event) {
    var trigger     = this;
    var container   = this.up('.slider').previous('.slide-info-box');
    var content     = this.href;

    new Ajax.Updater(container, content);
}

function init_studium() {
    if ($('picture-it')) {
        $$('.slide-content a').invoke('observe', 'click', update_image);
        $$('.slide-content a').each(function(el) { el.onclick = function() {return false;} });
    }
    if ($('studium-tips')) {
        $$('.slide-content a').invoke('observe', 'click', change_SlideInfo);
        $$('.slide-content a').each(function(el) { el.onclick = function() {return false;} });
    }
}

// Initialisierung nach Event DOMContentLoaded
document.observe("dom:loaded", init_studium);