you mean deactivate your post using setVisible (false)? I am unclear of the question you have posted.
In any case, look to the forum post: http://www.cocos2d-x.org/forums/19/topics/42588. I've been asking questions pertaining to touch swallowing and propogation and Huabin was really helpful. (still is)
1) with the HTML5 api , I believe you can getTouchPriority as well as Set it. Visibility not too sure
2) For every new layer that you've created and you wish to have that layer swallow any touch so that it does not permeate through to the layer beneath it (i presume it is your main game layer that is residing below the "exit" layer), add the touch events to the "swallowing" layer - refer to link above for touch functions - and set the "swallowing" (or "exit" in your context) layer with the following in the constructor:
this._isTouchEnabled = true;
*refer to source codes if in doubt