Image Mapping (thanks to Kita for the proper name) is when you make different links on one image with out having to cut it into different images. I'ts what I'm doing with my splash page.

1. Set the Map   You need to have your image code, with a little map bit in it. <img src="image.png" width="width" height="height" border="0" alt="" usemap="#image_Map"> You also need to put in a page anchor thing right after that. <map name="image_Map">.

2.Shading the areas that you are going to link to    Use this bit of code: right after the other codes. Coords stands for coordinates, which tells the browser which part of the image you are going to use. They go from top left, bottom left, top right, to bottom right. you can tell your coordinates by looking at the bottom right of the paint program's bottom bar. you should see two coordinates, those are the top left and bottom left ones. You can keep on putting in that last code for however many links you want on the image.
Finish it up by putting </map> at the end.
If you don't understand, E-mail me.