ok after i had made the orb from a tut
here i used some lightining brushes that i got online (google) from deviantart and i made three new layers and put a stamp of one lightning bolt on each layer and then put an effect of an outer glow white on each bolt. you might have to erase what would hang over w/e you made. then i clicked, in photoshop, window, animation and click the duplicate slide button a few times

. should look like this.
make sure in your layers only the background layer is selected on your first slide then on your second slide select layer 1 as well, by select i mean make visible. then slide 3 is background only, slide 4 has background and layer 2 visable, slide 5 is background only, and slide 6 has background and layer 3 visable. now by clicking the little drop down arrow on each slide change the time of slides 1,3,and 5 to 1 second and slide 2,4, and 6 to 0.2 seconds and the little drop down box under the first slide should say forever, if it dosnt, change it now. now we click file save for web and devices and hit save and your done.
if you want you can add a few slides inbetween to make the lightining fade in or out or flicker.
our Finished product following this tut looks like this
