function open_back_win(link, name, width, height, left, top)
  {
    if(!width)  width=400;
    if(!height) height=400;
    if(!left)   left=180;
    if(!top)    top=100;

    wopener = window.open(link, name, 'toolbar=0,location=0,status=0,resizable=1,scrollbars=1,width='+ width +',height='+ height +',top='+ top +',left='+ left);
    return wopener;
  }
  
 function open_print_win(link, name, width, height, left, top)
  {
    if(!width)  width=600;
    if(!height) height=700;
    if(!left)   left=180;
    if(!top)    top=100;
    if(!name)    name='print';

    wopener = window.open(link, name, 'menubar=1,toolbar=0,location=0,status=1,resizable=1,scrollbars=1,width='+ width +',height='+ height +',top='+ top +',left='+ left);
    return wopener;
  }