Changin Global Var On Runtime From Within Button?

I've been playing with writing a simple script that would entirely depend on a few variables declared right on top of it. Is there a way of changing them (in my case values of p, q, a & b) with a button if the button is part of the script?
Here's the script (just copy and paste entire thing into the first frame);


ActionScript Code:
//number of buttons & imagesvar n = 4;//indexing of buttons and images starts from:var k = 0;//starting left align point (_x value):var p = 100;//starting left align point (_y value) for images and buttons:var q = 100;//movie clip width:a = 400;//movie clip height:b = 200;//create a script assigning RGB color to a clipfunction combineRGB (red, green, blue) {        //combine the color values into a single number        var RGB = (red << 16) | (green << 8) | blue;        return RGB;}MovieClip.prototype.setRGB = function (colorValue) {        new Color (this).setRGB (colorValue);};//set colors:color0 = combineRGB (44, 115, 30);color1 = combineRGB (76, 98, 139);color2 = combineRGB (124, 54, 52);color3 = combineRGB (92, 92, 118);color4 = combineRGB (119, 91, 80);color5 = combineRGB (132, 74, 50);white = combineRGB (255, 255, 255);grey = combinedRGB (127, 127, 127);black = combineRGB (0, 0, 0);//declare a new Array: "colors" for retrieving values latercolors = [color0, color1, color2, color3, color4, color5, white, grey, black];//create a movie clip:this.createEmptyMovieClip ("container_mc", 200);this.container_mc.moveTo (p, q);this.container_mc.beginFill (0xFF0000);this.container_mc.lineTo (p + a, q);this.container_mc.lineTo (p + a, q + 200);this.container_mc.lineTo (p, q + 200);this.container_mc.lineTo (p, q);this.container_mc.endFill;//create buttons for controlling which images will slide into positionfor (i = k; i < n; i++) {        this.createEmptyMovieClip ("btn" + i + "_mc", i + 100);        //button height:        var bh = 8;        //spacing between buttons:        var bs = 8;        //button width:        var bw = (a - (n - 1) * bs) / n;        //button distance from the container clip:        var bd = bh * 2;        this["btn" + i + "_mc"].moveTo (p, q - bd);        this["btn" + i + "_mc"].beginFill (0xFF0000);        this["btn" + i + "_mc"].lineTo (p + bw, q - bd);        this["btn" + i + "_mc"].lineTo (p + bw, q - (bd - bh));        this["btn" + i + "_mc"].lineTo (p, q - (bd - bh));        this["btn" + i + "_mc"].lineTo (p, q - bd);        this["btn" + i + "_mc"].endFill;        //position buttons:        for (r = k + 1; r < n; r++) {                this["btn" + r + "_mc"]._x = (this["btn" + (r - 1) + "_mc"]._x) + (this["btn" + (r - 1) + "_mc"]._width + bs);        }}for (i = k; i < n; i++) {        this["btn" + i + "_mc"].onRelease = function () {                var btNameString = getProperty (this, _name);                t = btNameString.charAt (3);                container_mc.setRGB (colors[t]);        };}



I would want my container (and buttons since they're attached) to change position or size when the buttons are clicked so essentially I'd like to be able to change p and q values.

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