jQuery click event handler is called twice for a checkbox

Question

I have a problem with the following code in an ASPX page:

Answer 1

Solved: this to work with Firefox 3.6.12 and IE8.

$(function(){
        $("form input:checkbox").unbind("click")
        .click(function(){
            val = $(this).val();
            alert(val);
        })
    }

The trick is to unbind("click"). before bind it to .click(fn); this will disabled the same event to fire twice.

Note that event "change" will not tricker at first time checkbox has been checked. So I use "click" instead.