Guess file extension based on content-type. When downloading a file, and no path is supplied to store it, guess the file extension using mimetypes and the content-type header. Also supply a unit test for the HotLinkImageForm.

#map-canvas {
   width: 720px;
   height: 540px;
   border: 1px solid black;
   margin: 0 auto;
}
#map-info {
   margin-top: 2em;
}
div.band-balloon {
   width: 150px;
   height: 75px;
}