How to set the default button of a form from javascript?

Question

How to set the default button of a form using javascript or jQuery??

Answer 1

$(document).ready(function ()
{
    $(".tbPassword").keydown(function (e)           /* or keyup  */
    {
        if (e.keyCode == 13) // 27=esc
        {
            $("form").submit();
        }
    });
});