delaminating window

One of the side windows on the front of my ace tristar has begun to delaminate.The inner of the two plastic panes is becoming detached from the outer one. The 'weather tightness' of the van is not compromised, just the 'double-glazedness'. Before starting to search for either a new window or a replacement from a breakers, has anone had any success with gluing the panes together? If so,with what adhesive?

thanks, Mick Rumble