//

// "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 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 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 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,expires,path,domain,secure) {

  document.cookie = name + "=" + escape (value) +

    ((expires) ? "; expires=" + expires.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";

  }

}