How do I cancel the Save button functionality from Javascript in PWA 2010 timesheet page.?

Hi all,

I have to cancel the save button's original event to be ignored through the javascript.

Here is the scenario:

I have to cancel the save event in PWA 2010 timesheet page, when particular custom validation fails.

I have the code which does the validation in javascript and returns the true/false for the validation.

Now the thing is , I want to cancel the Save event when validation fails.

I tried returning the 'false', but did not work......

In 2007, we had used something like...

var save = LocateElementByTagID('input', 'idSaveBtn');var oldSave = save.onclick;// Replacement Save handlerfunction TimeSheetSaveOnClick() {var valid = CustomValidation();if (!valid)
        window.event.returnValue = false;else oldSave();return;
}

Since the way of handling the button is moved to Ribbon, is it possible to do the same thing in 2010?

Please let me know if there is a way.... or if you had already done similar to this...

please ask me if there is more details required....

Thanks...