Event.observe(window, 'load', function() {
        $('smileysdiv').hide();
        $('smileysdiv-listen').writeAttribute('src', 'http://www.fr-klassphilbochum.de/fileadmin/templates/add.png');
        Event.observe('smileysdiv-listen', 'click', function(){
            $('smileysdiv').toggle();
            if($('smileysdiv').visible()){
                $('smileysdiv-listen').writeAttribute('src', 'http://www.fr-klassphilbochum.de/fileadmin/templates/delete.png');
            } else {
                $('smileysdiv-listen').writeAttribute('src', 'http://www.fr-klassphilbochum.de/fileadmin/templates/add.png');
            }
        });
    });