Menu scroll beginner pls help

hi all,

i have a horizontal menu bar in a flash movie. it is so long(13 items) it jumps out of the stage. so i want it to float on the top horizontaly according to mouse over. when i take the mouse to left of menu bar the extreme left menu button should be visible and when at right menu bar the right menu button should be visible. with out mouse over the menu bar should be aligned to the center of bar.
is it possible. can any one guide me. i am beginner in flash scripting.

thanks in advance.