Zip Code Distance

Hello, is there a way to add a search feature that will give a geo-location of the zip codes entered? I would like to have a customer come to my site and say find Public Notary within 25 miles of zip code entered. This is much needed for this plugin I believe. I found this http://www.micahcarrick.com/php5-zip-code-range-and-distance.html it doesn't seem too hard, but it is to me a non-programmer:slight_smile:. Thanks!