20" iMac - Can it be used a a display for Sky+?

[subz]

Hello everyone, im new here and have a question.

I am about to buy a 20" iMac and would like to know if there is any way of connecting a sky+ box to it and using it as a display.

I cant see anything in the tech specs that would allow it as there is only usb and firewire inputs but if any of you know if (and how) it could be done that would be great!

thanks