Nuke Guestbook MYSQL Error When Using Hyphens

[robin1233]

I have got Nuke Guestbook customised and working properly, but whenever someone try's to add a hyphen to their message they get a mysql error, so everytime they try to add words like it's, don't etc the error appears. Is their any way to allow people to post messages including (') or some way to replace them as the post is being submitted to the #0180 method so MYSQL does not think it is a function and just plain text?

Thanks for any help

[robin1233]

It's alright now, I've sorted it out.
I had to add

$string=eregi_replace("'","''",$string);