var d = document;
var expdate = new Date ();
expdate.setTime (expdate.getTime() + (24 * 60 * 60 * 1000)); // 24 hrs from now

if (d.getElementById){ 
    d.write('<style type="text/css">\n')
    d.write('.blok ul ul {display: none;}\n')
    d.write('</style>\n');
}

function menu(obj){

	if(d.getElementById) {

	var el = d.getElementById(obj);
	var ar = d.getElementById("blok_oferta").getElementsByTagName("ul");

		if(el.style.display != "block") {
			for (var i=0; i<ar.length; i++){
				if(ar[i].className=="pdm") { 
					ar[i].style.display = "none";
					DeleteCookie('otwarty');
				}
			}
			el.style.display = "block";
			SetCookie ('otwarty', obj, expdate);
		} else {
			el.style.display = "none";
			DeleteCookie('otwarty');
		}
	}
}