Condesation in windows

Hi All,

I recently went out in my caravan which is fitted with the usual double skin type glazing, to find condensation between the two sections. Can anyone give me some advice about how to get this problem cleared, or am I looking at a complete new window??

There are a couple of small grommit or studs in the window and I wondered if the window could be vented from these.

Any help much appreciated.

Davy