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I am developing an application in which i want to disable f5 and backspace keys
for mozilla ,firerfox browsers.I have tried lots of code but didn't get the proper result. I just want to avoid reloading of page.If you have better option plz help.

try this if you just want to disable the F5 and Backspace functionality:
keyCode 116 ==> F5 key
keyCode 8 ==> Backspace

function disableF5BackSpace(e){
    evt = e || window.event;

    if(evt.keyCode == 116 || evt.keyCode == 8){

Hope this helps.

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