URL-REWRITE is a small package which can be used to programmatically
rewrite (X)HTML documents such that certain attributes values are
replaced by others. It was written to rewrite URLs (as in <a
href="..."> or <img
src="...">) for cookie-less session handling but
maybe you'll find other uses for it.
Complete documentation for URL-REWRITE can be found in the docs
directory or at the project site.