function zoom (adress, pic) {
imgwidth=100;
imgheight=100;
//posx=(screen.availWidth - imgwidth) /2;
//posy=(screen.availHeight - imgheight) /2;
posx=0;
posy=0;
wnd = window.open(adress+"?image="+ pic, "Großansicht", "width=" + 100 + ",height=" + 100+ ",left=" + posx + ",top=" + posy);
wnd.focus();
}