function openBig(id, img_w, img_h) {
    win_h=img_h+20;
    win_w=img_w+20;      
    main_big=window.open('/catalog/view_photo.php?id='+id+'&pic='+mn_big,'','scrollbars=0,resizable=1,width='+win_w+', height='+win_h+',toolbar=0');
}