Tag group name replace

I hope you’re…
Hi everyone,

I’m completely bogaged with (what I assumed would be fairly easy) string replace query.

I have a bunch of tags that I would like to link to posts rather than tags page. So the url reads:
url_address/%tag_category_name%/whatever

instead of:
url_address/tag/whatever

Sh/Could I use a string replace with this?

$tag->term_group outputs the tag category number which I would like to replace with the tag_group_name ($tag->term_group_name is not a valid argument).

Hope my ramblings make sense to someone out there.

Thanx for looking,
Sam

EDIT: forgot to add my code

echo bloginfo('url') . '/' . $tag->term_group . '/' . $tag->name;

to…

echo bloginfo('url') . '/' . $tag->term_group_name . '/' . $tag->name;