[CS4]External SWF

I've found various sites which tell how to load an external SWF, a simple thing apparently, but I just can't figure out how it works, and thus cannot remember any code. Can someone provide a way for me to load an external SWF, while another loader is loading the main movie. this is a simple SWF designed just so that users would have something nice to look at. or, if you could figure out how to compress a png to minuscule proportions and that could be placed on the 1st loader screen without playing a blank screen.