Not sure if this is an repost but,
Go here :
Imageshack - wowscrnshot090410192552.jpg
Jump so you will get here :
http://img534.imageshack.us/i/wowscr...0410192602.jpg
Just jump fowards towards the wall like this :
Imageshack - wowscrnshot090410192609.jpg
Posision yourself like this :
Imageshack - wowscrnshot090410192628.jpg
Jump on to the stairs, it can take a few tries.
End result :
Imageshack - wowscrnshot090410192641.jpg