Jumping ability.

i was hoping to work around with all these jumping abilitys..
so i ask
could some one direct me to a good tutrial wich shows how to create a jump skill?

There are many jumping abilities on here and at The Hive that are all slightly different, but largely the same. Have you tried downloading them, looking at the various parts, and trying to reconstruct something tailored to your specific needs?

And do you need a jump-attack or just a jump?

There are tons of threads that have been started here about parabolas. I think Anitarf has explained them at least 5 times, you can use the forum search tool, put in "jump" or "parabola" and I think you'll find what you need.