// 
// Cookie Functions - Second Helping (21-Jan-96) 
// Written by: Bill Dortch, hIdaho Design <bdortch@netw.com> 
// The following functions are released to the public domain. 
// 

//
// "Internal" function to return the 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 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	arg	= name + "=";
	var	alen = arg.length;
	var	clen = document.cookie.length;
	var	i =	0;
	while (i < clen) {
		var	j =	i +	alen;
		if (document.cookie.substring(i, j)	== arg)
			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	object containing the cookie name.
// value - String object containing	the	cookie value. May contain
// any valid string	characters.
// [expires] - 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 place holder. 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) {
	var	argv = SetCookie.arguments;
	var	argc = SetCookie.arguments.length;
	var	expires	= (argc	> 2) ? argv[2] : null;
	var	path = (argc > 3) ?	argv[3]	: null;
	var	domain = (argc > 4)	? argv[4] :	null;
	var	secure = (argc > 5)	? argv[5] :	false;
	document.cookie	= name + "=" + escape (value) +
		((expires == null) ? ""	: ("; expires="	+ expires.toGMTString())) +
		((path == null)	? "" : ("; path=" +	path)) +
		((domain ==	null) ?	"" : ("; domain=" +	domain)) +
		((secure ==	true) ?	"; secure" : "");
}

//
// Function	to delete a	cookie.	(Sets expiration date to current date/time)
// name	- String object	containing the cookie name
//
function DeleteCookie (name) {
	var	exp	= new Date();
	exp.setTime	(exp.getTime() - 1); //	This cookie	is history
	var	cval = GetCookie (name);
	document.cookie	= name + "=" + cval	+ "; expires=" + exp.toGMTString();
}

//
// Function to make a Date object which is N days from now
//
function DaysToDate(days) {
	var	exp	= new Date();
	exp.setTime(exp.getTime() + days*24*60*60*1000);
	return exp;
}