[Flash8]Help needed! Naming an Instance '1'

Hi in one of the (fantastic) kirupa tutorials on making random colour, the example code provided works because some squares have instance names as numbers 1,2,3,4,5 etc.

I can open the source file and the instances show up with those names. But when I try and create clips in my file and name them 1 or whatever (so I can use the supplied code) Flash tells me it is not a valid name for an instance. I can however import the movie clip from the kirupa source file and it still is called 1.

Any suggestions appreciated.

best

tommy banana