First you might like to have a look at the instructions for the animator. Here is the link back to the presentation and back to the demonstration entry.

In all cases, as you can see on the figures, you want to hide as many tool buttons as you manage (in netscape there are some small 'arrows' to do that), find out how to do that for your browser.

To compare the two animations, it is best to use the frame version with the two animations in each its frame, so that you can have them both in one window. See this discussed below

If you do not have frames, or you are using small screen:
Open two windows of the browser (with MicroSoft Internet Exploder you probably start it once more to have to windows) and arrange them as shown on the figure:

To have picture like this, you pause (see  instructions for the animator) both of the animations and take both to the start. You see that the densities are the same, both represent an |m|=1 state, but the p- runs with the clock, the p+ against the clock.  (Link back to the presentation.)

Then you can advance each animation by single frames to compare the time development. Note that the projectile is moving in the upper half of the plane. What we see is that when the electron runs with the projectile (p- case), the transfer is more probable and more smooth. Also, it is transfered to an oriented state (current in 'circle'), while in the other case (p+) the transferred part is more aligned than oriented, and it is smaller.

(Link back to the presentation and back to the demonstration entry.)

Frame version
 
Here we use the two animations without any explaining text moved into two frames in one window. The use is much simpler, but you need at least 800 pixels wide screen to be able to use this, preferably larger. And you should make your browser window as large as possible. Otherwise the use is as above. Ther are however small problems with MicroSoft Internet Exploder, where the two ImagePlayers in two frames get confused. Thus the controls are not functioning properly. The solution is to switch them to 'Play once' instead of 'loop' mode, then they stop (anyway in the Exploder the author has available; advice - if you can, use Netscape or other browser which supports the real JavaScript).