misted bathroom window Help! please

clem28_2

Hi ,my bathroom window has blown, i want to replace the double glazed window pane.
i know the window is either internal or externally beaded but cant make my mind up which?.
looking at the outside of thw window the black seals between glass and beadings look like they have been removed before comparing with the internal beads and seals.
have tried gently to remove the internal bead using putty knife but seam to be tight.
i am wondering if the external black seals need removing first, then try to remove internal beads then.
i need to remove the pane to get dimentions etc to order the new pane.
any help would be welcome,
clemm

Reece_

Can you post a photo? On one side you usually have a wedge gasket which needs removing first to release pressure, then the beading on the opposite side is removed.
Generally this wedge black gasket looks thicker than the one you may have on the opposite side that's attached to the removable beading.