Incrementing an Array of Movies

[font=verdana, arial, helvetica][size=2]Hi all, I’m trying to create a spinner for different ads for an advertising company website. Each ad has a name, such as “out” “pie” and “bigger”. All of them are turned off except “pie” to start off with:

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//initialize movie
var itemArray:Array = new Array();itemArray[0] = out;
itemArray[1] = pie;
itemArray[2] = bigger;
itemArray[3] = better;
//
for (var i = 0; i<itemArray.length; i++) {	
var clip:MovieClip = itemArray*;	
clip._visible = false;
}
backBTN._visible = 0;
pie._visible = 1;

[font=verdana, arial, helvetica][size=2]The thing is, I can’ figure out the button script to cycle through this array. I want to click a forward and back button, lets use forward for now, and do something like (don’t mind the syntax):

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on (release) { 
i+1, remember the spot, and make everything else invisible. 
When you click again, you increment to the 
next ad/instance name and so on.
}

What is the actual syntax for this?