Spawn a prefab

Hi again, I am a noob at unity and javascript, but so far I have had some luck regarding this project I am experimenting with; however, that luck has run out. I have been trying to figure out how to spawn a prefab particle after it has been destoryed, but to no avail have I succeeded. Help would be greatly appreciated. And if someone could also tell me how to show my java script thing on this site, would be greatly appreciated.

[28501-unity+2014-06-30+14-40-49-42.jpg|28501]

Right up the top it say Harness Object None. Assign a GameObject or prefab here by dragging one in. Then it will work