added onbeforeunload event to check for running test before leaving page
added onbeforeunload event to check for running test before leaving page

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