how to authenticate user password

[yelekeri]

How to authenticate a user in the web page with the active directory using 
perl ldap. Basically what I want is to get the password of the user on the 
web page (may be encryted or atleast text) and compare that password thru 
LDAP. And if the password matches, wants to display some other page. How 
to acheive this thru perl LDAP. 

-yelekeri