What's wrong with this code?

programming flash
1

I’m attaching a movie clip to _root and giving that mc an onRelease code.
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#808080]// I’ve made a box mc that’s well… a box. Linked to AS of course.[/COLOR]
[COLOR=#0000ff]_root[/COLOR].[COLOR=#0000ff]attachMovie[/COLOR][COLOR=#000000]([/COLOR][COLOR=#ff0000]“box”[/COLOR], [COLOR=#ff0000]“inst”[/COLOR], [COLOR=#000080]0[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#808080]// This works…[/COLOR]
[COLOR=#0000ff]_root[/COLOR].[COLOR=#000080]inst[/COLOR].[COLOR=#0000ff]onRelease[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000ff]trace[/COLOR]COLOR=#000000[/COLOR];
[COLOR=#000000]}[/COLOR]
[/LEFT]
[/FONT]

Now… I try to attach an mc, this time from an external image file.
1st code — doesn’t work
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#0000ff][COLOR=Gray]// I attach an empty movie clip that’s in the library[/COLOR]
_root[/COLOR].[COLOR=#0000ff]attachMovie[/COLOR][COLOR=#000000]([/COLOR][COLOR=#ff0000]“empty”[/COLOR], [COLOR=#ff0000]“inst”[/COLOR], [COLOR=#000080]0[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#0000ff]loadMovie[/COLOR][COLOR=#000000]([/COLOR][COLOR=#ff0000]“img/c1.png”[/COLOR], [COLOR=#ff0000]“inst”[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#0000ff]_root[/COLOR].[COLOR=#000080]inst[/COLOR].[COLOR=#0000ff]onRelease[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000ff]trace[/COLOR]COLOR=#000000[/COLOR];
[COLOR=#000000]}[/COLOR]
[/LEFT]
[/FONT]

2nd code — still doesn’t work
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#0000ff]_root[/COLOR].[COLOR=#0000ff]createEmptyMovieClip[/COLOR][COLOR=#000000]([/COLOR][COLOR=#ff0000]“inst”[/COLOR], [COLOR=#000080]0[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#0000ff]loadMovie[/COLOR][COLOR=#000000]([/COLOR][COLOR=#ff0000]“img/c1.png”[/COLOR], [COLOR=#ff0000]“inst”[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#0000ff]_root[/COLOR].[COLOR=#000080]inst[/COLOR].[COLOR=#0000ff]onRelease[/COLOR] = [COLOR=#000000]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000ff]trace[/COLOR]COLOR=#000000[/COLOR];
[COLOR=#000000]}[/COLOR]
[/LEFT]
[/FONT]

What am I doing wrong here? Is there something that I need to additionally do?