function set_cookie (name, value, exp_y, exp_m, exp_d, path, domain, secure) {
	var cookie_string = name + "=" + escape(value);
	if (exp_y) {
		var expires = new Date(exp_y, exp_m, exp_d);
		cookie_string += "; expires=" + expires.toGMTString();
	}
	if (path)	cookie_string += "; path=" + escape(path);
	if (domain)	cookie_string += "; domain=" + escape(domain);
	if (secure)	cookie_string += "; secure";
	document.cookie = cookie_string;
}

function get_cookie (cookie_name) {
	var results = document.cookie.match (cookie_name + '=(.*?)(;|$)');
	return results ? unescape(results[1]) : null;
}

function delete_cookie (cookie_name) {
	var cookie_date = new Date ();  // current date & time
	cookie_date.setTime (cookie_date.getTime() - 1);
	document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}

function setSound(mode) {
	set_cookie('sound', mode, null, null, null, '/');
}

function getSound() {
	return (get_cookie('sound') == 2) ? false : true;
}

function _utf8_decode (utftext) {
	var string = "";
	var i = 0;
	var c = c1 = c2 = 0;

	while ( i < utftext.length ) {

		c = utftext.charCodeAt(i);

		if (c < 128) {
			string += String.fromCharCode(c);
			i++;
		}
		else if((c > 191) && (c < 224)) {
			c2 = utftext.charCodeAt(i+1);
			string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
			i += 2;
		}
		else {
			c2 = utftext.charCodeAt(i+1);
			c3 = utftext.charCodeAt(i+2);
			string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
			i += 3;
		}

	}

	return string;
}

function base64_decode(input) {
	var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
	var output = "";
	var chr1, chr2, chr3;
	var enc1, enc2, enc3, enc4;
	var i = 0;

	input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

	while (i < input.length) {

		enc1 = _keyStr.indexOf(input.charAt(i++));
		enc2 = _keyStr.indexOf(input.charAt(i++));
		enc3 = _keyStr.indexOf(input.charAt(i++));
		enc4 = _keyStr.indexOf(input.charAt(i++));

		chr1 = (enc1 << 2) | (enc2 >> 4);
		chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
		chr3 = ((enc3 & 3) << 6) | enc4;

		output = output + String.fromCharCode(chr1);

		if (enc3 != 64) {
			output = output + String.fromCharCode(chr2);
		}
		if (enc4 != 64) {
			output = output + String.fromCharCode(chr3);
		}

	}

	output = _utf8_decode(output);

	return output;

}