function setCookie (name, value, expires) {
	if (!expires) expires = new Date();
	document.cookie = name + "=" + escape (value) +
	"; expires=" + expires.toGMTString() + "; path=/";
	}
}

function getCookie (name) {
	var dcookie = document.cookie;
	var cname = name + "=";
	var clen = dcookie.length;
	var cbegin = 0;
		while (cbegin < clen) {
		var vbegin = cbegin + cname.length;
			if (dcookie.substring(cbegin, vbegin) == cname) {
			var vend = dcookie.indexOf (";", vbegin);
				if (vend == -1) vend = clen;
			return unescape(dcookie.substring(vbegin, vend));
			}
		cbegin = dcookie.indexOf(" ", cbegin) + 1;
			if (cbegin == 0) break;
		}
	return null;
}

function delCookie (name) {
	var expireNow = new Date();
	document.cookie = name + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT" + "; path=/";
}