Those of you who have been using the 'Click here to call us for free' HTML line in your Gmail signatures using the above procedure will have found that the script no longer works with the new version of Gmail, commonly known as Gmail 2.0.
While we are waiting for the author of Better Gmail 2 to restore the presently crippled add-on to its former glory, I managed to get it working again by following the instructions on
HTML Signatures for Gmail 2
Hopefully, one day in the not too distant future, Gmail itself will allow HTML signatures. That would make things a lot easier. It's something a lot of people have asked for but the Gmail developers have been slow to react on. Anyway, this should get you by in the meantime.
Mark