Reducing signature box height according to signature size

[pigpog]

I'm having trouble with my signature boxes. When you write a short post the signature box takes up a huge amount of the posting space.

You can see on the attachments included where the problem area is. This is dead signature box space. What I want to do is have this space reduced down to where the signature starts.

I've tried adding a height attribute to the sig box code but all it does is give me a set height for everyone's signature box so they all look the same. This is a nice bit of code but, for people with smaller siggies they end up with a huge empty siggy box because it's the same height as the siggy box for someone with a longer signature, for example.

I hope I'm explaining this properly... if you think you can help but need me to try and be more clear I'll try!

This is what I don't want but have now:

Attachment 98820

This is what I want:

Attachment 98821

(click on the images to enlarge them).

Thanks anyone!

Kate xxx