Added on-unload handler when canceling editing a page
Added on-unload handler when canceling editing a page

hansjoachim/fitnesse,rbevers/fitnesse,jdufner/fitnesse,amolenaar/fitnesse,rbevers/fitnesse,amolenaar/fitnesse,jdufner/fitnesse,rbevers/fitnesse,jdufner/fitnesse,hansjoachim/fitnesse,amolenaar/fitnesse,hansjoachim/fitnesse