Class help with .as files (Quick Novice)

programming flash
1

Hi guys, I usually make my files on a single .fla file. But now I have a class and don’t know how to set it up.

The file is on website - Bit-101 called “AS3 Sound Synthesis IV – Tone Class” (Please google as I can’t seem to use links here)

I have copied the Tone code into a file called Tone.as.
Now, where do I put the

 ActionScript Code:
 [LEFT][COLOR=#993300]import[/COLOR] flash.[COLOR=#000000]events[/COLOR].[COLOR=#000000]MouseEvent[/COLOR];

[COLOR=#993300]var[/COLOR] tone:Tone = [COLOR=#993300]new[/COLOR] ToneCOLOR=#000000[/COLOR];
[COLOR=#993300]stage[/COLOR].[COLOR=#000000]addEventListener[/COLOR][COLOR=#000000]([/COLOR]MouseEvent.[COLOR=#000000]CLICK[/COLOR], onClick[COLOR=#000000])[/COLOR];
[COLOR=#993300]function[/COLOR] onClickCOLOR=#000000[/COLOR]:[COLOR=#993300]void[/COLOR]
[COLOR=#000000]{[/COLOR]
tone.[COLOR=#000000]frequency[/COLOR] = [COLOR=#000000]300[/COLOR] + mouseY;
tone.[COLOR=#993300]play[/COLOR]COLOR=#000000[/COLOR];
[COLOR=#000000]}[/COLOR]
[/LEFT]

I tried to put it in the .fla and it does not work. I have no idea, any help? Where do I put it, do I need to add anything? and also if you know, do I need to call the filename something specific?

Thanks!