Joomla site external login

[kakaajee]

Hi, Friends,

Dostoo main aik website bana raha tha. jis main external login module require hay. Means kay meray paas user ka apna login page design hay. Jis may koi joomla ka component ya module nahi hay.
Main user ko website open kernay per uss page per lay ker aana chahta hoon aur logout yaa session time out per b user koo uss page per redirect kerna chahta hoon.

Aap logon main say agar kisi nay koi aisa kam kia hoo ya any idea, that how can I do that.

Thanks in Advance.