UK County Map & Image Maps

I need a map of the UK showing counties that the user can then click on. I've determined that without using flash I can use image maps, and I have a large png county map that I can use.

However, to execute this I would be spending the better half of a day clicking dots on the lines between counties, and would have to repeat the exercise should I make a mistake, browser crashes, or the results arent satisfactory, 开发者_运维技巧or the image needs resizing.

Is there an easier way to pull this off without paying out or a large dose of repetitive clicking?

This Dundas Maps support page provides a lengthy list of resources for (mostly) free map data.