function show_picture (picture_name) {

var target =  'cgi-bin/blue_engine_picture_chain/perl/blue_engine_show_picture.pl?' + picture_name;
var frame_properties = 'width=' + blue_engine_show_picture_frame_width + ',height=' + blue_engine_show_picture_frame_height + ',scrollbars=no';
window.open(target,'help',frame_properties);
}