Script validation in Jsp page

Question

We have used the following code snippet in my Jsp page.
window.onbeforeunload = function (evt)
                         var message = 'Waring message';
                         if (typeof evt == 'undefined')
                              evt = window.event;
                         if (evt && (evt.clientX <0 || evt.clientY <0)) {
                              return message;
We introduced this code when the user navigates to other screen without saving current change we wanted to give warning message.
This is working when the user click back,refresh,front butons and entering new URL in address bar.
Below address bar we are having menu link(Link Sun forums link avilable below address bar).If the user clicks new menu this event is not capured.Becuase of that we are not getting warning message. Please let me know how to capture that event too..
Thanks,
Sujeeth

Answer 1

As Balus stated, this is not the right forum:)
You should read about javascript and html, but I'll try to explain very quickly
1) window is the object representing the page loaded
2) it has some default event handler, and in javascript you have the right to overwrite them, as you are doing
3) to bind event handler, in general, you should retrieve a reference to the object in javascript, and then add an event listener. There are some cross-browser compatibilities for that and i suggest you to use Yahoo UI libraries to work that out:)
Best Regards
edmondo