var foto_windows = new Array();
function open_foto(url, winname, width, height) {
  width = width + 18;
  height = height + 27;
  foto_windows[foto_windows.length] = window.open(url,winname,'height='+height+',width='+width+',resizable=0,scrollbars=no,menubar=no,status=no');
  for(i = 0; foto_windows.length > i; i++) {
    if(!foto_windows[i].closed) foto_windows[i].focus();
  }
}