Small AS2 code to AS3

Been trying to convert this to AS3, but keep running into little errors that i’m unsure how to solve. It’s a simple horizontal, scrolling gallery with clickable images that open a larger one on top. Can anyone help me out. Possibly explain?

ActionScript Code:
[LEFT][COLOR=#0000FF]import[/COLOR] mx.[COLOR=#000080]transitions[/COLOR].[COLOR=#000080]Tween[/COLOR];

[COLOR=#0000FF]import[/COLOR] mx.[COLOR=#000080]transitions[/COLOR].[COLOR=#000080]easing[/COLOR].*;

[COLOR=#0000FF]this[/COLOR].[COLOR=#0000FF]createEmptyMovieClip[/COLOR][COLOR=#000000]([/COLOR][COLOR=#FF0000]“container”[/COLOR], [COLOR=#000080]1[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#808080]// change number to how many images are in gallery[/COLOR]
[COLOR=#000000]var[/COLOR] imagesNumber:[COLOR=#0000FF]Number[/COLOR] = [COLOR=#000080]10[/COLOR];
[COLOR=#000000]var[/COLOR] scrolling:[COLOR=#0000FF]Boolean[/COLOR] = [COLOR=#000000]true[/COLOR];

[COLOR=#0000FF]for[/COLOR] [COLOR=#000000]([/COLOR]i=[COLOR=#000080]1[/COLOR]; i<=imagesNumber; i++[COLOR=#000000])[/COLOR] [COLOR=#000000]{[/COLOR]
container.[COLOR=#0000FF]attachMovie[/COLOR]COLOR=#000000[/COLOR];
thumb_mc = container[COLOR=#000000][[/COLOR][COLOR=#FF0000]“thumb”[/COLOR]+i+[COLOR=#FF0000]"_mc"[/COLOR][COLOR=#000000]][/COLOR];
thumb_mc.[COLOR=#0000FF]_x[/COLOR] = COLOR=#000000[/COLOR]thumb_mc.[COLOR=#0000FF]_width[/COLOR];
thumb_mc.[COLOR=#0000FF]_y[/COLOR] = COLOR=#000000[/COLOR]/[COLOR=#000080]2[/COLOR];
thumb_mc.[COLOR=#0000FF]_alpha[/COLOR] = [COLOR=#000080]50[/COLOR];
thumb_mc.[COLOR=#000080]largeImage[/COLOR] = i;
thumb_mc.[COLOR=#0000FF]onRollOver[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]this[/COLOR].[COLOR=#0000FF]_alpha[/COLOR] = [COLOR=#000080]100[/COLOR];
[COLOR=#000000]}[/COLOR];
thumb_mc.[COLOR=#0000FF]onRollOut[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]this[/COLOR].[COLOR=#0000FF]_alpha[/COLOR] = [COLOR=#000080]50[/COLOR];
[COLOR=#000000]}[/COLOR];
thumb_mc.[COLOR=#0000FF]onRelease[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]this[/COLOR].[COLOR=#0000FF]_alpha[/COLOR]=[COLOR=#000080]50[/COLOR];
[COLOR=#0000FF]for[/COLOR] [COLOR=#000000]([/COLOR]i=[COLOR=#000080]1[/COLOR]; i<=imagesNumber; i++[COLOR=#000000])[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#000000]var[/COLOR] [COLOR=#0000FF]movieClip[/COLOR] = container[COLOR=#000000][[/COLOR][COLOR=#FF0000]“thumb”[/COLOR]+i+[COLOR=#FF0000]"_mc"[/COLOR][COLOR=#000000]][/COLOR];
[COLOR=#0000FF]movieClip[/COLOR].[COLOR=#0000FF]enabled[/COLOR] = [COLOR=#000000]false[/COLOR];
[COLOR=#000000]}[/COLOR]
scrolling = [COLOR=#000000]false[/COLOR];
[COLOR=#0000FF]_root[/COLOR].[COLOR=#0000FF]attachMovie[/COLOR]COLOR=#000000[/COLOR];
large_mc.[COLOR=#0000FF]_x[/COLOR] = COLOR=#000000[/COLOR]/[COLOR=#000080]2[/COLOR];
large_mc.[COLOR=#0000FF]_y[/COLOR] = COLOR=#000000[/COLOR]/[COLOR=#000080]2[/COLOR];
[COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]large_mc, [COLOR=#FF0000]"_alpha"[/COLOR], Strong.[COLOR=#000080]easeOut[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]100[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]container, [COLOR=#FF0000]"_alpha"[/COLOR], Strong.[COLOR=#000080]easeOut[/COLOR], [COLOR=#000080]100[/COLOR], [COLOR=#000080]50[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
large_mc.[COLOR=#0000FF]onRelease[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]this[/COLOR].[COLOR=#0000FF]enabled[/COLOR]=[COLOR=#000000]false[/COLOR];
scrolling = [COLOR=#000000]true[/COLOR];
[COLOR=#000000]var[/COLOR] fadeOut = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]large_mc, [COLOR=#FF0000]"_alpha"[/COLOR], Strong.[COLOR=#000080]easeOut[/COLOR], [COLOR=#000080]100[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]container, [COLOR=#FF0000]"_alpha"[/COLOR], Strong.[COLOR=#000080]easeOut[/COLOR], [COLOR=#000080]50[/COLOR], [COLOR=#000080]100[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
fadeOut.[COLOR=#000080]onMotionFinished[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]for[/COLOR] [COLOR=#000000]([/COLOR]i=[COLOR=#000080]1[/COLOR]; i<=imagesNumber; i++[COLOR=#000000])[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#000000]var[/COLOR] [COLOR=#0000FF]movieClip[/COLOR] = container[COLOR=#000000][[/COLOR][COLOR=#FF0000]“thumb”[/COLOR]+i+[COLOR=#FF0000]"_mc"[/COLOR][COLOR=#000000]][/COLOR];
[COLOR=#0000FF]movieClip[/COLOR].[COLOR=#0000FF]enabled[/COLOR] = [COLOR=#000000]true[/COLOR];
[COLOR=#000000]}[/COLOR]
large_mc.[COLOR=#0000FF]removeMovieClip[/COLOR]COLOR=#000000[/COLOR];
[COLOR=#000000]}[/COLOR];
[COLOR=#000000]}[/COLOR];
[COLOR=#000000]}[/COLOR];
[COLOR=#000000]}[/COLOR]
container.[COLOR=#0000FF]onEnterFrame[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]if[/COLOR] COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]this[/COLOR].[COLOR=#0000FF]_x[/COLOR] += [COLOR=#0000FF]Math[/COLOR].[COLOR=#0000FF]cos[/COLOR]COLOR=#000000[/COLOR]
[COLOR=#000080]15[/COLOR];
[COLOR=#0000FF]if[/COLOR] COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]this[/COLOR].[COLOR=#0000FF]_x[/COLOR] = [COLOR=#000080]0[/COLOR];
[COLOR=#000000]}[/COLOR]
[COLOR=#0000FF]if[/COLOR] COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]this[/COLOR].[COLOR=#0000FF]_x[/COLOR] = -COLOR=#000000[/COLOR];
[COLOR=#000000]}[/COLOR]
[COLOR=#000000]}[/COLOR]
[COLOR=#000000]}[/COLOR];
[/LEFT]