Having trouble with Particle System

I have just started learning JavaScript from The Walker Boys unity tutorials and I have reached this video.

In this video they are using an old version of unity and the particles move with the tangent velocity , but when I try to do the same thing purple particles appear while the white particles stand in the same spot . Am I doing something wrong ? If yes , can you please show me how to fix it ?

Unity 4 has a new particle system. The old still works though and also allows for more control with scripting.

You can use the script discussed here to easily add them via menu: