What is the correct way to use attachMovie?

I’m trying to make a file that creates an empty MC, then another MC is attached. Here is what I have, but it isn’t working:

_root.createEmptyMovieClip(ASClip, this.getNextHighestDepth);
ASClip.attachMovie(“logoMC”, “TBLogo”, 5, {_x:0, _y:450, _alpha: 50});

In the linkage properties for logoMC, I have the identifier set as “logoMC” and I left everything else blank.