// Cookie Management

/* File Functions:
   1. setCookie - writes cookie
   2. getCookie - gets value of cookie
   3. removeCookie - deletes a cookie
   4. detectCookies - checks if cookies are enabled
*/

function setCookie(cookieName, cookieValue, expireDays)
{
	/* Pass in three strings - the name of the cookie, the value, and the 
	number of days until expiration. 
	Pass in a "" empty string for expireDays to set a session cookie (no 
	expires date). 
	Pass in any other date for expire as a number of days to be added to 
	today's date. */
   
	var expires = "";
	var re = /^\d+$/;

	/* make sure expireDays is a number */
	if (expireDays != "" && re.test(expireDays))
	{
		expires = new Date();
		expires.setDate(expires.getDate() + expireDays);
		expires = expires.toGMTString();
	}
	document.cookie = cookieName+"="+cookieValue+";expires="+expires;
}

function removeCookie(cookieName)
{
	/* Pass in the name of the cookie as a string and it will be removed. */
	var expires = new Date();	
	document.cookie = cookieName+"= ;expires="+expires.toGMTString(); }

function getCookie (cookieName)
{
	cookieValue = ""
	if (document.cookie.indexOf(cookieName) == -1)
	{
		/* there is no cookie by this name for this user */
		return cookieValue;
	}
	else
	{
		/* get the beginning index of the cookie by looking for the cookie name */
		cookieStart = document.cookie.indexOf(cookieName);
		/* get the beginning index of the cookie value by looking for the equal sign after the name */
		cookieValStart = (document.cookie.indexOf("=", cookieStart) + 1);
		/* get the end index of the cookie value by looking for the semi-colon after the value */
		cookieValEnd = document.cookie.indexOf(";", cookieStart);
		/* if no semi-colon, then use the whole length */
		if (cookieValEnd == -1)
		{
			cookieValEnd = document.cookie.length
		}
		/* use substring to get the text between the two indices and that is 
		the value of the cookie */
		cookieValue = document.cookie.substring(cookieValStart, cookieValEnd);
		return cookieValue;
	}
}

function detectCookies()
{
	/* function returns true if cookies are enables, false if not */
	setCookie("test", "test", "");
	tmp = getCookie("test")
	if (tmp != "test")
	{
		return false;
	}
	else
	{
	return true;
	}
}

/*
------------------------------
SAVE COOKIE:

if (detectCookies())
{
	setCookie("MY_COOKIE_NAME","VALUE", ""); // Last Param: "" means session cookie
	setCookie("MY_COOKIE_NAME","VALUE", number of days); // Last Param: expiry date.
}

------------------------------
READ:
if (detectCookies())
{
	var lastQry = getCookie("MY_COOKIE_NAME");
}
*/