I have something written down that I have kept from the very begining. I dont know if it is "out of date" but I will but it up anyway.
Init:
this setpos [(getpos this select 0),(getpos this select 1), 5 ];
All you need to do is change the BOLD variable to whatever you want. The higher the number, the higher it goes.
Remember it doe not need to be 1 2 3 4 5 numbers,
you can also do : 2.7 or something for exact measure.
BTW: Do not space the ending.. I just did that so the forums can read it correctly