Is there any possible way to limit the signature to x amount of lines or something?

I actually think my own sig is too long. After having 'Your attitude determines your altitude' on there for so long, having a 2-line quote seems strange. I'm hoping to change my quote every few weeks ... a bit of humor in the sig ... or should I ditch it altogether?

Matthew
98.5 Contour SE V6
It has spent 1.5 years under the wrong identity ;-)