function otevrit(dokument,sirka,vyska,centrovat,pozice_l,pozice_h) {
	if (centrovat == 1) {
	  so = screen.width;
		vo = screen.height;
		zleva = ((so - sirka) / 2) - 13;
//		shora = (vo - vyska) / 2;
		shora = 100;
	} else {
	  zleva = pozice_l;
		shora = pozice_h;
	}
  popup_win = window.open(dokument,"popup_okno","width="+sirka+",height="+vyska+",left="+zleva+",top="+shora+",location=0,menubar=0,resizable=0,scrollbars=1,status=0,titlebar=0,toolbar=0,resizable");
  popup_win.focus();
}