/*  Cookie Library -- "Night of the Living Cookie" Version

	Written by: Bill Dortch, hIdaho Design <bdortch@hidaho.com>
	The following functions are released to the public domain. */

/* ********************************************************** */

/*  "Internal" function to return decoded value of a cookie */
function getCookieVal (offset) {
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1) {
		endstr = document.cookie.length;
	}
	return unescape(document.cookie.substring(offset, endstr));
}

/*  Function to correct for 2.x Mac date bug. Call this function
	to fix a date object prior to passing it to SetCookie.
	IMPORTANT: This function should only be called *once*
	for any given date object! See example at the end of this
	document. */
function FixCookieDate (date) {
	var base = new Date(0);
	var skew = base.getTime();
	// dawn of (Unix) time - should be 0
	if (skew > 0) {
	// except on the Mac - ahead of its time
		date.setTime(date.getTime() - skew);
	}
}

/*  Function to return the value of the cookie specified by
	"name".
		name - String object containing the cookie name.
		returns - String object containing the cookie value, or
		null if the cookie does not exist. */
function GetCookie (name) {
	var temp = name + "=";
	var tempLen = temp.length;
	var cookieLen = document.cookie.length;
	var i = 0;
	while (i < cookieLen) {
		var j = i + tempLen;
		if (document.cookie.substring(i, j) == temp) {
		return getCookieVal(j);
		}
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
	}
	return null;
}

/*  Function to create or update a cookie.
	name - String object containing the cookie name.
	value - String object containing the cookie value. May
	  contain any valid string characters.
	[expiresDate] - Date object containing the expiration data
	  of the cookie. If omitted or null, expires the cookie at
	  the end of the current session.
	[path] - String object indicating the path for which the
	  cookie is valid. If omitted or null, uses the path of the
	  calling document.
	[domain] - String object indicating the domain for which the
	  cookie is valid. If omitted or null, uses the domain of
	  the calling document.
	[secure] - Boolean (true/false) value indicating whether
	  cookie transmission requires a secure channel (HTTPS).
	
  	  The first two parameters are required. The others, if
	  supplied, must be passed in the order listed above. To
	  omit an unused optional field, use null as a placeholder.
	  For example, to call SetCookie using name, value and path,
	  you would code:
	
		SetCookie ("myCookieName", "myCookieValue", null, "/");

	  Note that trailing omitted parameters do not require a
	  placeholder. To set a secure cookie for path "/myPath",
	  that expires after the current session, you might code:

		SetCookie (myCookieVar, cookieValueVar, null,
	    "/myPath", null, true);
*/
function SetCookie (name,value,expiresDate,path,domain,secure) {
	document.cookie = name + "=" + escape (value) +
		((expiresDate) ? "; expires=" +
		expiresDate.toGMTString() : "") +
		((path) ? "; path=" + path : "") +
		((domain) ? "; domain=" + domain : "") +
		((secure) ? "; secure" : "");
}

/*  Function to delete a cookie. (Sets expiration date to start
	of epoch)
	name - String object containing the cookie name
	path - String object containing the path of the cookie to
	delete. This MUST be the same as the path used to create the
	cookie, or null/omitted if no path was specified when
	creating the cookie.
	domain - String object containing the domain of the cookie to
	delete. This MUST be the same as the domain used to create
	the cookie, or null/omitted if no domain was specified when
	creating the cookie. */
function DeleteCookie (name,path,domain) {
	if (GetCookie(name)) {
		document.cookie = name + "=" +
			((path) ? "; path=" + path : "") +
			((domain) ? "; domain=" + domain : "") +
			"; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}