Hey there, i found this cool thing https://jsfiddle.net/wvp4scLL/137/ and got some idea in my maind 
i m really not so good at this kind js 
i would like to make balls to change movement when they hit and also to add url or div inside balls !
Is that possible? Well i know it is but how to achieve this?
The normal way is to use the pythagoras theorem of a²+b²=c² where each ball is checked against every other ball. if the distance is smaller than the sum of their radii, you know that they have hit each other.
i actually found something that bounce http://jsfiddle.net/vdcSv/50/ but some times it miss
That code’s a little more complex because they’re using squares rather than circles.
With circles, it’s pretty simple: Take the centerpoint of the circle (which is where SVG circles would be easier, because they define themselves as a centerpoint and radius, but the ones in your first fiddle can be found fairly simply too as x+width/2, y+height/2). Compare that to every other circle’s current centerpoint via a^2+b^2=c^2 (IE: dx^2+dy^2 = d^2, dx = x2-x1, dy = y2-y1, solve for d). If d <= radius of the circle * 2, they’ve collided.
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