I got Nearly 500 Adsense templates from a friend(He is distributing them freely to all.His email is alexkmm@yahoo.com).But i dont know where i have to edit my adsense publisher id.Please help me in this regard.

Is he the one who developped the templates ? Check for a readme.txt file that may explain which file contains your AdSense publisher ID. Most likely there is a single file that is used as part of an include in the actual content pages.

Rob