[DaFive]

Короче даже сорсов не надо:

package
{
	import flash.display.MovieClip;
	import flash.display.Shape;
	import flash.events.MouseEvent;
 
	public class Test extends MovieClip
	{
		var mc_1:Shape = new Shape();
		var mc_2:Shape = new Shape();
 
		public function Test()
		{
			stage.addEventListener(MouseEvent.MOUSE_MOVE, onMcMove);
 
			mc_1.graphics.lineStyle(1, 0);
			mc_1.graphics.drawCircle(0, 100, 20);
 
			mc_2.graphics.lineStyle(1, 0xff0000);
			mc_2.graphics.drawCircle(400, 100, 20);
			addChild(mc_2);
			addChild(mc_1);
		}
 
		var last_mc_1_x:Number;
		var k:int = 1;
		var delta:Number = 0;
 
		private function onMcMove(e:MouseEvent):void 
		{
			mc_1.x = mouseX;
 
			k = (last_mc_1_x > mc_1.x) ? 1 : -1;
 
			delta = Math.abs(mc_1.x - last_mc_1_x);
 
			last_mc_1_x = mc_1.x;
 
			if (mc_1.hitTestObject(mc_2))
			{
				mc_2.x += delta * k;
			}
		}
	}
}