(REAL TUFFY ) Lat/Long Map Image Manipulation

Okay this is a tuffy! I am really just looking for someone to point me in the right direction, or tutorials or something! maybe ideas 1st - I have created a Lat and Long distance calculator... it takes 2 user inputed zip codes... accesses the MySQL DB for the Lat and Longs... then figures out the distance between them... Now there are 2 things I want to do here... take a map of the US... PNG.. GIF... what ever... and associate the Lat/Long with coordinates on the image... like a image map in HTML (sort of) - the first thing I want to do is draw a line from point A to point B (on the map)... the second is draw a circle for a search radius... hmmm... it would also be cool if the image could be zoomed in on.... like... scaled down to 100 mile x 100 miles... and then show the 75 mile radius circle.... okay, that's enough for now... hope someone can point me in the right direction Joe Harman http://www.HarmanMedia.com Health nuts are going to feel stupid someday, lying in hospitals dying of nothing. - Redd Foxx