How can i adjust placement of _mc on the stage, if that makes sense

Hello,

I’m pretty new at Flash and just reverse engineered this code to fulfill my needs but I have hit a stumbling block, I have a stage that is 780 x 560 px and I want to place a movieclip within a frame on the page. Right now the code tells the movieclip to start at the beggining of the stage and scrolls to the end of the stage and I want it to start like 100px in and end like 100px from the end of the stage, if that makes sense. Here is the code with my dummy notes:

//
// NOTES ABOUT THE GALLERY
// EACH THUMB SHOULD BE 140H x 260W
// EACH THUMB IS RGB, 72dpi, and JPG 7 QUALITY
// EACH IMAGE IS ALSO RGB 72dpi but full res not cropped JPG 7 QUALITY @ 5.75" High
//
import mx.transitions.Tween;
import mx.transitions.easing.*;
this.createEmptyMovieClip(“container”,1);
// Number of images to show in thumb strip
var imagesNumber:Number = 15;
// Start Scrolling on load = true Scroll after clicking image = false
var scrolling:Boolean = true;
var imagesWidth:Number = 0;
var spacing:Number = 0;

for (i=1; i<=imagesNumber; i++) {

container.attachMovie(“thumb”+i,“thumb”+i+"_mc",i);
myThumb_mc = container[“thumb”+i+"_mc"];

myThumb_mc._x = imagesWidth;
imagesWidth += myThumb_mc._width+spacing;
//myThumb_mc._x = (i-1)*myThumb_mc._width;
//
// Tell thumbstrip to run through the center of stage"/2"
// adjust the divider to change placement
//
myThumb_mc._y = (Stage.height-myThumb_mc._height)/2.5;
// Thumbs open at XXX%
myThumb_mc._alpha = 100;
myThumb_mc.largerImage = i;
// Rolled over thumbs change to XXX%and back with the RollOut function
myThumb_mc.onRollOver = function() {
this._alpha = 100;
};
myThumb_mc.onRollOut = function() {
this._alpha = 100;
};
// After being clicked image chages to XXX% until rolled on again
myThumb_mc.onRelease = function() {
this._alpha=100;
for (i=1; i<=imagesNumber; i++) {
var myClip = container[“thumb”+i+"_mc"];
myClip.enabled = false;
}
//
// Tells image to open in the center of the stage"/2"
// adjust the divider to change placement
//
scrolling = false;
_root.attachMovie(“image”+this.largerImage,“large_mc”,2);
large_mc._x = 67
large_mc._y = 117
//
// Fade in and fade out functions
// Starts at X to X alpha and at what speed
//
new Tween(large_mc, “_alpha”, Strong.easeOut, 0, 100, 0.5, true);
new Tween(container, “_alpha”, Strong.easeOut, 100, 50, 0.5, true);
large_mc.onRelease = function() {
this.enabled=false;
scrolling = true;
var myFadeOut = new Tween(large_mc, “_alpha”, Strong.easeOut, 100, 0, 0.5, true);
new Tween(container, “_alpha”, Strong.easeOut, 50, 100, 0.5, true);
myFadeOut.onMotionFinished = function() {
for (i=1; i<=imagesNumber; i++) {
var myClip = container[“thumb”+i+"_mc"];
myClip.enabled = true;
}
large_mc.removeMovieClip();
};
};
};
}
//
// Speed of thumbstrip based on x position of the cursor
//
container.onEnterFrame = function() {
if (scrolling) {
this._x += Math.cos((-_root._xmouse/Stage.width)*Math.PI)*15;
if (this._x>0) {
this._x = 0;
}
if (-this._x>(this._width-Stage.width)) {
this._x = -(this._width-Stage.width);
}
}
};

So it loads images and thumbs from the library that were imported to the stage in the flash file. Any help would be really appriciated, thanks!