There are loads of image map makers available. Take a look at http://www.google.com/search?hl=en&lr=&ie=UTF-8&safe=off&q=freeware+image+map
Download a couple and see which you find easiest to use.
If your graphics or HTML editor shows the cursor position on the graphic you could write this yourself. See http://www.javascriptkit.com/howto/imagemap.shtml or
http://www.kasparius.com/nonflash/tutorial/tut1.htm