Need help with macro

[pergolesi]

I have a macro I made myself and because I'm a newbie at macros I 'm not sure how to improve it:

/petattack
/castsequence hunter's mark, concussive shot, aimed shot

It works like it should, I press the key and it casts petattack and hunter's mark, I press again and it does concussive shot, and again, aimed shot.
I can't make it do all at once, though I'd like to. Problem is that when the sequence is interrupted, (the target dies or leaves the scene), I go to a new target but the macro is still set after the last item; that is, I push the key and it does aimed shot without having concussive shot first. I'm not sure how to fix it.

Of course there's hundreds of macros out there, but I'd like to understand more about how they work. By the way what does #showtooltip mean?

[Lothaer]

/petattack
/castsequence reset=combat hunter's mark, concussive shot, aimed shot

[Tunga]

That, or you can use "reset=target" to reset it whenever you change target.

#showtooltip means that when you hover the button for the macro it will show the tooltip of the spell which the macro is going to cast when you click it.

[pergolesi]

Thanx, that's perfect!