LoadMovie Problem with swf

I have used this code

mc_container.loadMovie(“assessment.swf”);

I have created a container (a square box of 600x450), converted it into movie clip,dragged it to the stage and given it a name “mc_container”

it does load an external SWF however:

  1. the external swt is 800x600 and is going beyond the screen

  2. the external swf seems to stop functioning, i.e. the buttons within do not work

why?