Ford Focus 2004 model leaking windscreen

Hi I have a 2004 1.6 Ford Focus that has a leaky windscreen at the top of the passenger side. I noticed this the other day after a downpour. Around the top of the window where the fabric is is all damp and running my finger under the seal inside the car at the top of the windscreen it is wet. While it was raining it was also dripping water inside the car from the top. Has anyone had a similar problem? i''m taking it in monday to the dealer to check.