AS3 - How to Communicate Between Classes

package
{
	import flash.display.*;
	import flash.events.*;
 
	
	public class NewsSub2 extends MovieClip
	{		
				
		public function NewsSub2()
		{
			this.addEventListener(MouseEvent.MOUSE_OVER, over);
			this.addEventListener(MouseEvent.MOUSE_OUT, out);
//want to add this:
this.addEventListener(MouseEvent.CLICK, nav);
			
//now go see the CLICK function below:
 
			this.stop();
			this.buttonMode = true;
		}
		
		
		private function over(event:MouseEvent):void
		{
			if(this.currentFrame == 1)
			{
				this.gotoAndPlay(1);
			}
			
			
			if(this.currentFrame == 10)
			{
				this.gotoAndStop(10);
			}
						
			if(this.currentFrame == 11)
			{
				this.gotoAndPlay(9);
			}
			
			if(this.currentFrame == 12)
			{
				this.gotoAndPlay(8);
			}
			
			if(this.currentFrame == 13)
			{
				this.gotoAndPlay(7);
			}
			if(this.currentFrame == 14)
			{
				this.gotoAndPlay(6);
			}
			if(this.currentFrame == 15)
			{
				this.gotoAndPlay(5);
			}
			if(this.currentFrame == 16)
			{
				this.gotoAndPlay(4);
			}
			if(this.currentFrame == 17)
			{
				this.gotoAndPlay(3);
			}
			if(this.currentFrame == 18)
			{
				this.gotoAndPlay(2);
			}
			if(this.currentFrame == 19)
			{
				this.gotoAndPlay(1);
			}
 
			
		}
		
		private function out(event:MouseEvent):void
		{
			if(this.currentFrame == 1)
			{
				this.gotoAndStop(1);
			}
			if(this.currentFrame == 2)
			{
				this.gotoAndPlay(18);
			}
			if(this.currentFrame == 3)
			{
				this.gotoAndPlay(17);
			}
			if(this.currentFrame == 4)
			{
				this.gotoAndPlay(16);
			}
			if(this.currentFrame == 5)
			{
				this.gotoAndPlay(15);
			}
			if(this.currentFrame == 6)
			{
				this.gotoAndPlay(14);
			}
			if(this.currentFrame == 7)
			{
				this.gotoAndPlay(13);
			}
			if(this.currentFrame == 8)
			{
				this.gotoAndPlay(12);
			}
			if(this.currentFrame == 9)
			{
				this.gotoAndPlay(11);
			}
			
			
						
			if(this.currentFrame == 10)
			{
				this.gotoAndPlay(10);
			}
			
			if(this.currentFrame == 19)
			{
				this.gotoAndStop(1);
			}
			
		}
	
	private function nav(event:MouseEvent):void
		{
			???SEPARATE CLIP???.gotoAndPlay("Selected Thumbnail");
// Naming the separate clip results in RunTime Error 1009 or 1010
		}
		
	}
}

                                  

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