import traer.physics.Attraction;
import traer.physics.Particle;
import traer.physics.ParticleSystem;
import traer.physics.Spring;

import com.greensock.TweenLite;
import com.greensock.easing.*;

var s:ParticleSystem = new ParticleSystem(new Vector3D(0, 0, 0), .2);
var repellerAttractedTo = null;
var floats = new Array();
var anchors = new Array();
var repells = new Array();


var magnet = s.makeParticle(1, new Vector3D(0, 0, 0));
var repeller = s.makeParticle(4, new Vector3D(0, 0, 0));

for(var i=0; i< container.numChildren; i++){
	var self = container.getChildAt(i);
	self.id=i;
	self.addEventListener(MouseEvent.MOUSE_OVER, spotOver);
	self.addEventListener(MouseEvent.MOUSE_OUT, spotOut);
	self.buttonMode=true;
	floats[i]= s.makeParticle(0.12, new Vector3D(self.x, self.y, 0));
	anchors[i]= s.makeParticle(0.12, new Vector3D(self.x, self.y, 0)); anchors[i].makeFixed();
	s.makeSpring(anchors[i], floats[i], 0.1, 0.1, 0);
	//s.makeAttraction(magnet, floats[i], 20000 , 0);
	repells[i] = s.makeAttraction(repeller, floats[i], -80000 , 0);
}

stage.addEventListener( Event.ENTER_FRAME, loop );

function spotOver(e){
	repeller.position.x = mouseX;
	repeller.position.y = mouseY;
	repellerAttractedTo = e.currentTarget;

	repells[e.currentTarget.id].turnOff();

	TweenLite.to(e.currentTarget,1,{scaleX:1.2,scaleY:1.2,ease:Elastic.easeOut});
	repeller.mass=4;
	//TweenLite.to(repeller,0.5,{mass:4});
}

function spotOut(e){
	repellerAttractedTo = null;
	TweenLite.to(e.currentTarget,1,{scaleX:1,scaleY:1,ease:Elastic.easeOut});
	//repeller.mass = 0;
	//repells[e.currentTarget.id].turnOn();
	TweenLite.to(repeller,0.01,{mass:0.1, onComplete:repellOn,onCompleteParams:[e.currentTarget]});
}

function repellOn(obj){
	repells[obj.id].turnOn();
}

function loop(e){
	s.tick(1);
	magnet.position.x = mouseX;
	magnet.position.y = mouseY;
	
	for(var i=0; i< container.numChildren; i++){
		container.getChildAt(i).x = floats[i].position.x;
		container.getChildAt(i).y = floats[i].position.y;
	}
	if(repellerAttractedTo){
		repeller.position.x = repellerAttractedTo.x;
		repeller.position.y = repellerAttractedTo.y;
	}
	
}

http://www.adamcoulombe.info/lab/as3/PolkaDot-Hover-Repulsion-Effect.html

Demo + FLA Download:http://www.adamcoulombe.info/lab/as3/PolkaDot-Hover-Repulsion-Effect.html .................. This demo uses Arnaud Icard's Traer AS3 port for physics to simulate repulsion. Each polka-dot will be repelled from the polka dot that you have hovered over.

AS3 Hover / Repulsion Polka Dots

actionscript, flash

ActionScript 3