function popup($i){
  winpopup = window.open ('img/pic/pic'+$i+'.jpg', 'popupwin','toolbar=no,scrollbars=no,status=no, width=850, height=650, left='+((myBrowser.getScreenWidth()-500)/2)+',top='+((myBrowser.getScreenHeight()-430)/2));
  winpopup.focus(0);
}