/**
  ustawienie cookie
  @param string p_cookie nazwa cookie
  @param string p_value wartosc cookie
  @param integer valid liczba dni waznosci
*/
function setCookie(p_cookie, p_value, valid) {
	var t_expires = new Date();
	var time = '';
	
	t_expires.setTime( t_expires.getTime() + (valid * 24 * 60 * 60 * 1000));
	time = t_expires.toGMTString();
	
  	document.cookie = p_cookie + "=" + escape(p_value) + "; expires=" + time + "; path=/";
  	
  	return true;
}