function enterPressed(e, controlToPostBack){
    if (!e) var e = window.event;
    
    if (e.keyCode)
    {
        code = e.keyCode;
    }
    else if (e.which)
    {
        code = e.which;
    }

    if (code == 13)
    {
        __doPostBack(controlToPostBack, '');
        return false;
    }
}