Rewind and Fast Forward buttons

I have a flash file that is basically a slide show that continues to go through the pages(different layers of movie clips - not scenes). I would like to have four buttons on the bottom of the page:
Rewind - negative 48 frames from current frame
Pause - I have this working
Play I have this working
Fast Forward - advance 48 frames from current frame
What is the action script to advance or decrease the frames?
How do I grab the current frame number and add or subtract from it?
I have tried gotoandplay (++48); but get an error and (+48) takes me to the 48th frame.
Thanks