function wopen(url, w_name, w_width, w_height){
gWindow = window.open(url, 'photo_window', "menubar=no,toolbar=no,scrollbars=no,status=no,top=50,left=50,width="+w_width+",height="+w_height);
gWindow.focus();
gWindow.document.open();
gWindow.document.write(""+ w_name +"");
gWindow.document.close();
}