function get_cookie ( cookie_name )
{
  var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

  if ( results )
    return ( unescape ( results[2] ) );
  else
    return null;
}

function setCookie(c_name,value)
{
    document.cookie=c_name+ "=" +escape(value)+"; path=/;";
}

function lang_select()
{
    lang=get_cookie('lang');
    if (lang == "en_US")
	{
	    setCookie('lang','es_SP');
	}
    else
	{
	    setCookie('lang','en_US');
	}
    window.location.reload();
}