Image Hotspots

Hi,

I would like to have an image of the world map and create hot spots on each continent that link through to another page within the site.

I have attaempted to do this by breaking the image into a table layout but i have massive gaps inbetween each section which make it look messy.

http://entinno.com/research/

I have also tried writing the code for an actual iumage that uses hot spots and thisdidnt work either.

Any ideas?

Thanks
Harriet