Enabling SSO using HTTP Post

Hi there, i have been trying to link our SSO platform with ADselfservice plus reset password.

What i try to achieve is to pass some value inside http POST into adselfservice and give the user the reset page

I have been trying using this strings.. but seem not working.. i have try various syntax to inlcude the domain name too. We are autheticated using LDAP

https://Address/j_security_check?j_username=usern&j_password=Password&DOMAIN_NAME=PRI&loginButton=Login

at first we want to put the above URL on our portal page and the SSO will pass value to the ADSelfServicePlus..

Can this be done ? Im new on this...