To edit the images use PowerPoint 
Do As SaveAs --> png
Open Image in GIMP
Reduce the Image
   Right Click on image --> Image --> Scale Image...
   Orginal Image = 960x720
   New width = 450 (should re-calculate height to 338)
   
Do As SaveAs from GIMP to save the reduced image

To Re-make the image map
In GIMP Right Click --> Filter --> Web --> ImageMap
Draw shapes around hot zones
Save the map to disk
Copy the map into the html page or XML document it is need in.
