ActionScript 2.0 :: Make A Button Change A Variable, And Add A Number And String?

I would like to make a dynamic button on a website I am working on. I would like one button to update a variable, and another set of buttons to add 1 or subtract one from the variable I have buttons on the left side of the page for some bands that load conent into an empty movie clip.

The website: [URL]

I would like to set up some forward and backward arrows above that content on the right, so users can also scroll through the content in order. So if someone loads the content for soul asylum, and click the back arrow, it goes back to the Wailers, and if they click the forward arrow, it goes to Swollen Members. So there is an order of pages: 1. Wailers, 2. Soul Asylum, 3. Swollen Members, 4. Passafire, 5. Beats Antique, 6. SFM Kind of an order of importance. The idea is if somebody starts by clicking #3 Swollen Members, my application will know that it is on #3 and the arrows will go to #2 or #4.

Is there a way for the main artist buttons on the left to reset a variable for the current slide? So if someone clicks on the Swollen Members picture button, a variable called currentselection equals 3 And then when the forward arrow is clicked, it will ad 1 to the current selection and load movie #4

So in VB the main Swollen Members button would be something like: im currentselection as int = 3 Which would reset the current page as 3

Then the forward arrow would have code like:

Dim Nextselection as Int
Nextselection = & currentselection +1 & ".swf"

And the button in flash would be something like:

on (release) {
loadMovie("Nextselection", "rightcontent_MC")}

Which would load 4.swf the slide for passafire.

So how would I do this in action script 2.0?