function toggle(obj,obj2){
	var el = document.getElementById(obj);
	var obr = document.getElementById(obj2);
	if (el.style.display != 'none') {
		el.style.display = 'none';
		obr.src = '../_d/ol_zdanie/wz_roz.gif';
	}
	else {
		el.style.display = '';
		obr.src = '../_d/ol_zdanie/wz_zwin.gif';
	}
}