Requested WoW macro

Hey guys i just wanted to give a good pvp macro, When you got target on a dps and you've got a healer doing heals etc and you want to cc him with Paralysis without targeting him you can instead drag you mouse pointer on him without press and have to target him and press this macro then he will be stunned without even loosing the main target and on DPS you can even keep on dpsing while you doing it so here it is :

/cast [@mouseover] Paralysis; [@focus,exists, harm] Paralysis; [@target,exists,harm] Paralysis

(sorry for bad english btw )