Triangle construction (ha, ta and symetral of angle alfa)

Sorry for my bad English. First I'm new here so hello everyone. I need fast help! I got this construction task:

Make a construction of triangle ABC if you have

height on side "a"
gravity on side "a"
symetral of angle alfa

It's like on this picture:

http://www.slibe.com/images/2b6e1f94-untitled_JPG.jpg

I hope you can help me if you understood me. Further thanks to all of you

Bye

p.s. I need this fast, until 13:00 hours (on european time gmt +1) :(