var nowOp = 0;

      function shimg(id)
      {
        if (nowOp != 0) closeimg(nowOp);
        var d_height;
        var d_width;
        if (document.body.clientHeight)
        {
          d_height = document.body.clientHeight;
          d_width = document.body.clientWidth;
        }else{
          d_height = document.body.offsetHeight;
          d_width = document.body.offsetWidth;
        }
        var scrolltopv = document.body.scrollTop;
        if (!scrolltopv && document.documentElement.scrollTop) scrolltopv = document.documentElement.scrollTop - 200;
        d_height = (d_height / 2) + scrolltopv - 250;
        d_width = d_width / 2;
        //alert(d_height);
        document.getElementById('bigfoto_' + id).style.top = d_height + 'px';
        document.getElementById('bigfoto_' + id).style.left = d_width + 'px';
        document.getElementById('bigfoto_' + id).style.display = 'block';
        nowOp = id;
      }
      function closeimg(id)
      {
        document.getElementById('bigfoto_' + id).style.display = 'none';
        nowOp = 0;
      }