[Koha] OPAC customisation

Dear Professionals, I wuld like to customise the interface of Koha OPAC. Which file I have to be rewrite for this purpose? Anybody have prior experience with this work, please share your experience. Vimal Kumar Asian School of Business Technopark Trivandrum-695 581 vimal0212@yahoo.com --------------------------------- Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail Beta.