window.addEvent('domready',function() {
    $each($$('.hausbild_thumb'), function(el) {     
        var original = el.getStyle('opacity');      
        var morph = new Fx.Morph(el,{ 'duration':'300', link:'cancel' });
        var morph_start = new Fx.Morph(el,{ 'duration':'0', link:'cancel' });
        morph_start.start({ 'opacity': 1 });
        el.addEvents({
            'mouseenter' : function() { morph.start({ 'opacity':0.5 }) },
            'mouseleave' : function() { morph.start({ 'opacity': 1 }) }
        });
    });
});