Login To Vbulletin Forums Using Htmlunit

i am trying to login vbulletins forum using htmlunit i can connect to my forum and set my username and password but when click in login button i can not login into my user this is

Solution 1:

I set these values in the below tags and I could login to my user:

input type="hidden" name="vb_login_md5password"
input type="hidden" name="vb_login_md5password_utf"