GMTV has confirmed that its online iBook give-away competition cannot be accessed by Macintosh users.

The online competition that started on Monday invites viewers to win five iBooks each day this week.

GMTV explained that the Web site's drop-dialler technology used to randomly select competition winners is not Mac compatible.

"We discussed a cross-platform drop dialler with several technology companies. The feedback we received forced us down the PC route, as it proved difficult to implement a reliable multi-platform solution acceptable to the majority of our users," the company stated.

GMTV continued: "This technology is still in its infancy and we are making every effort to introduce a dialler that will cover a wide range of platforms. In the meantime, we can only apologise to Apple users."