URL delimiter not SEO friendly

[eniach]

Big problem with URL delimiter: the script uses comma "," as a delimiter , i'll give an example below:

http://dir.topbuild.org/atractii,turistice,categ-95.htm

The problem is that this kind of delimiter is not so SEO friendly; I'd like to use "-" (minus) as a delimiter (so the URL would look like this http://dir.topbuild.org/atractii-tur...-categ-95.htm), but the problem is I dont know where to change it (besides the .htaccess file, where I've managed to change those 3 lines of rules).

If any of you have a sugestion how to do this, I'll be more than happy to know.
Thank you, and good luck with your directories