function op_popup(gif_name, gif_width, gif_height) {
var tmp_width=gif_width;
var tmp_height=gif_height;
var Neu = window.open('', 'g1', 'screenX=200,screenY=200,width='+tmp_width+',height='+tmp_height);
Neu.document.write('\n');
Neu.document.write('Zoom :: Bild\n');
Neu.document.write('\n');
Neu.document.write('\n');
Neu.document.write(' 
\n');
Neu.document.write('\n');
Neu.document.write('\n');
Neu.document.close;
}