function submitenter(myfield, e, btn)
{
    var keycode;
    if (window.event)
        keycode = window.event.keyCode;
    else if (e)
        keycode = e.which;
    else
        return true;

    if (keycode == 13)
    {
        if (btn == 0)
        {
            if (document.getElementById('ctl00_btnSearch') != null)
                document.getElementById('ctl00_btnSearch').click();
        }
        else if (btn == 1)
        {
            if (document.getElementById('ctl00_ContentPlaceHolder1_btnShowAdvice') != null)
                document.getElementById('ctl00_ContentPlaceHolder1_btnShowAdvice').click();
        }
        return false;
    }
    else
        return true;
}