[General] after login / register go to index not before where u comefrom

[mylife]

i had search all setting but not seen it..

my problem when user not register browse all page other than index for example read on thread http://abc.com/forumdisplay.php?fid=21 and same time login .. after that he will go index page

i want user/guest after login or register go to where it come from (not index)

thanks ............

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anyone can help me plzzzzzzzzz.........