Blockbuster plans to introduce an online video player that will function only on select Motorola cellphones that will give consumers access to its on-demand service. The movie-rental company said that owners of the handsets will be able to access "thousands" of movies -- but it did not indicate what the service will cost or whether new movies will be included. (Some producers have barred newly released DVDs from being made available via on-demand services.) Blockbuster said in a statement that it "eventually" plans to make its on-demand player available for use on numerous consumer-electronics devices and enable users to search its entire catalog and download available titles for rent or purchase, schedule movies for mail delivery or for in-store pickup or at one of its kiosks.