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<img src="worldmap.jpg" alt="Worldmap" title="Map of the World" usemap="#world"><map name="world">
<area href="uk.html" alt="United Kingdom" title="United Kingdom" shape="poly" coords="150,217,190,257,150,297,110,257">
<area href="us.html" alt="United States" title="United States" shape="poly" coords="10,20,100,20,120,100,5,110">
More areas for each country...
</map>
I think you'll need the title attribute, rather than just the alt text to display popups cross-browser (ie. in Firefox)
The coords are the pixel coordinates on your world map image. Using shape="poly" you can have complex multi-sided shapes, as you'd probably need for countries on a map. Other possibilities for shape are "circle" and "rect".
I guess this is what Dreamweaver will do, but will just make it easier to mark out the areas (coords).