Help with an "unload" or remove child

1

So I don’t know what the best way to do this is but I have not had this trouble while scripting on the time line and since custom classes are new to me maybe y’all could help a bit.

//Pages
package classes
{

import flash.display.*;
import flash.events.*;
import flash.net.URLRequest;	

public class Pages extends MovieClip
{
	// initialize -----------------------------------------------------------------------------

	public function Pages()
	{
		super();
	}
	// API ------------------------------------------------------------------------------------

	public function loadPage(swf:String):void
	{
		var myRequest:URLRequest=new URLRequest(swf);
		var myLoader:Loader = new Loader();
		myLoader.load(myRequest);
		addChild(myLoader);
		myLoader.x = -400;
		myLoader.y = -270;
	}
}

}

the addChild is working fine but the previous .flv won’t go away.
Any help would be greatly appreciated, thanks