ColorMatrixFilter

Does anyone know if its possible to attach a timer to control a slider?

Or alt remove the slider_mc and replace with a timer so that an image desaturates gradually after 60 seconds?

here is the file im looking at http://www.senocular.com/flash/files/desaturateimage.fla
[URL=“http://www.senocular.com/flash/files/desaturateimage.fla”]

any help will be appreciated.
thanks