As i wrote, im in look for an addon that does around the same as targetring addon does in warhammer..

Actually an addon that makes it easier to see whom you have targeted.. especially on BGrounds this is handy, its often a player dissapear for me in the crowd..

So i hope someone can help :)

Blizzard has never put in that capability for exactly that reason: the abilities of certain races and classes to blend into a crowd would become useless. However, here is a workaround, of sorts. Go into your Interface settings, and on one of the screens there is Sticky Targeting. You will keep that target targeted unless at least one of the following is met.

a) the target dies

b) the target vanishes using some appropriate ability

c) you click on a different target

d) you press the Esc key to release the sticky