Attaching Movies

I am having problems accessing a button after I have attached it to the stage from the library…

My code is as such:

map_mc.onRelease = function(){
empty_mc.attachMovie(“map_functions”,“map_close”,this.getNextHighestDepth());
}
empty_mc.map_close.close_mc.onRollOver = function(){
this.colorTo(0x20AEAE,1.5);
}

On the rollover - the movie recognises nothing as executable.

OK >> Yes - I have linked in the properties, an identifier for AS Export … for the original map_functions, inside it is an MC called close_mc - This MC is linked for AS Export as close_mc

…Why is this not working?

PS. the function calls are from Lacos Tween engine.

Any Advice would be great …