ActionScript 3.0 :: Opening A Swf Within An Application?

I have a main contents page and what I want to do is when the user click the button for a section then the relevant swf will load whilst the contents page closes. If this can't be done then is there a way to just get the relevant swf to open up in a new flash window?

I have done the following:

PercentageOfAQuantityBtn.addEventListener(MouseEve nt.CLICK, GoPercentageOfAQuantity);
function GoPercentageOfAQuantity(evt:MouseEvent):void {
navigateToURL (new URLRequest ("02 Percentages.swf"));
}

This code however loads the swf file in my internet browser instead of a new flash window.