var myrules = 
{
    'input.cc_form_basic_Button' : function(element)
    {
        element.onclick = function() 
        {
            if (!document.getElementById('acceptance').checked)
            {
                alert('You must accept the privacy statement before you can join the mailing list.');
                return false;
            }
            else
            {
                window.location = "http://ui.constantcontact.com/d.jsp?m=1101215600258&p=oi&og=wa&ea=" + element.previousSibling.previousSibling.value;
                return true;
            }
        };
    }
};

Behaviour.register(myrules);