function resize_image(img, maxwidth, maxheight)

{

  img.oldwidth = img.width;

  img.oldheight = img.height;



  if (img.oldwidth > maxwidth || img.oldheight > maxheight)

  {

    if ((img.oldwidth / maxwidth) > (img.oldheight / maxheight))

    {

      img.width = maxwidth;

      img.height = img.oldheight / (img.oldwidth / maxwidth);

    }

    else

    {

      img.height = maxheight;

      img.width = img.oldwidth / (img.oldheight / maxheight);

    }

  }

}



function popup(img)

{

  if (img.oldwidth != null && img.oldheight != null)

  {

    if (img.width < img.oldwidth || img.height < img.oldheight)

    {

      void window.open(img.src, "", "resizable=yes,scrollbars=yes,width=" + img.oldwidth + ",height=" + img.oldheight);

    }

  }

}