deleting Root in avl tree,Help me plz!

[sajast]

Hi everyone
I have a project about avl tree Implemention.
I've written a deleteNode function that deletes the nodes of avl tree , but when i have only 1 node (root) the function doesn't work properly ! i mean that i can't delete root from my avl tree ! Could you plz help me and tell me what i do ?!
Thanks in advance ...
sajast