It worked like a charm, thanks you all guys!
I just describe briefly what I did if there's someone newbber than me at quakec (difficult but possible

)who's trying to do something similar
First of all I created a func_button with key
target and value act1 then I created an entity (I used a player start and changed after the classname)with classname play_doghost and
targetname act1
I make
target and
targetname bold just because they at first seemed to me difficult to understand!
a line will appear to emphasize the connection between the func_button and the entity
the code Nahuel kindly posted is autoexplanatory: the play_doghost function is called inside the editor and executed
Thanks again folks!!