Button plays movie clip symbol?

I am probably going to get yelled at for posting this question, but I have looked for an answer for about two hours and can’t find anything.

I want to make a time line (timeline is my graphic not the timeline in cs4, like historical timeline WWI, WWII, ETC) with clickable dates (D-DAY, Pearl HARBOR), when you click on a date it will fade in a semi-transparent box that has text (still seeing the original stage in the background behind the semi-transparent text box), when you are done reading the text box you can hit GO BACK to go to the historical timeline.

I only have been using flash for about 3 months so bare with me.

I understand button symbol, movie clip symbol, etc. I can make it so that when you are OVER the date it plays an animation of the text box fading in but is kind of bad because if you move the mouse off the date it goes away, which is why I want to make it clickable.

Basically I think I just need help with the actionscript, I am using CS4 by the way.

In short, make a button that when hit plays a movie clip animation of the textbox fading in front of the historical timeline, I believe I can easily do the go back by using the gotoAndPlay(); feature on the go back button to go to the beginning of the scene.

Sorry about the long text, I am pretty sure the answer is easy. I used the war reference so you get i am talking about a line with dates timeline, not the timeline in CS4, lol get it?

Thanks in advance!