[Zope] Character Swapping / Mapping

I have an URL coming out of a database like "http://www.myplace.com" and need to pass it to another website but they want it in the format of "http%3A%2F%2Fwww%2Emyplace%2Ecom". Is there a simple method to do this with or some sort of VAR tag? If not, what is the find and replace tag? Thanks, JMA