Load movie into library (dynamic identifiers?)

I would like to load an indefinite number of jpgs into the library and then attach them when convenient to mcs on my stage via attachMovie or anything really just not loadMovie again. Im readapting some code, so simple loadMovie will not work. I must somehow be able to load a jpg once and then be able to link it to a preexisiting mc at several random times without reloading the jpg. Is there anyway of defining an identifier to a loaded movie?

Answers in danish are fine.

Thanks

Stanford