Need a good scripters help with something small

I'm trying to get scar to start a procedure when i click a letter on my keyboard and i can't figure out how. I used to know how but i know I'm doing something wrong. Here is what i put.

Program ClickMonster;

Procedure Click;
Begin
If keydown('a') then
begin
(Click locations)
end;
end;

begin
click;
end.

this is just a simple example what am i doing wrong?

 

If Iskeydown('a') then