ASCII code for Left Mouse Button?

What is the ASCII code, if any, for the left mouse button?
I want my character to shoot, without having to use:
onClipEvent(enterFrame) {
if(key.isDown(key.CONTROL)) {
this.gotoandstop("gunfire");
}

It works fine, but it is a graveyard of boring.

I finally got my character to run and rotate properly, and now I just want to use the mouse button to make the character shoot.

Can anyone help?

Ah:

onClipEvent(mouseDown) {
blah
}

Thanks anyway.