function trigger_effect(src_element,element,first_img,second_img){
    Effect.toggle(element, 'Blind', {duration:.5,afterFinish:function(){
    image = src_element.getElementsByTagName('img')[0];
    image.src = image.src.match(first_img) ? second_img : first_img;
    }});
    return true;
}
function kill_div(element){
    $(element).style.visibility = "hidden";
}