function Cookie(document, name, days, path, domain, secure) {
/* The constructor function: creates a cookie object for this document,
with a specified name and optional attributes.  From "JavaScript",
O'Reily, 1998, example 18-1.
Arguments:
  document: Required Document object value.
  name:     Required string for the name of the cookie.
  days:     Optional number that specifies the days from now
            that the cookie should expire.
  path:     Optional string that specifies the cookie path attribute.
  domain:   Optional string that specifies the cookie domain attribute.
  secure:   Optional Boolean value, if true, requests a secure cookie.

All the predefined properties of this object begin with '$'
to distinguish them from other properties which are the values to
be stored in the cookie.
*/
  this.$document = document;
  this.$name = name;
  if (days)
    this.$expiration = 
      new Date((new Date()).getTime() + days * 86400000);
  else this.$expiration = null;
  if (path)   this.$path   = path;   else this.$path   = null;
  if (domain) this.$domain = domain; else this.$domain = null;
  if (secure) this.$secure = true;   else this.$secure = false;
}

function _Cookie_store() {  // store method of cookie object
/* First, loop through the properties of the Cookie object and
put together the value of the cookie. Since cookies use the
equals sign and semicolons as separators, we'll use colons
and ampersands for the individual state variables we store 
within a single cookie object. Note that we escape the value
of each state variable, in case it contains punctuation or other
illegal characters.
*/
var cookieval = "";  // clear actual cookie value
  for(var prop in this) {  // Ignore "$" properties, and methods
    if ((prop.charAt(0) == '$') || 
        ((typeof this[prop]) == 'function')) 
        continue;
    if (cookieval != "") cookieval += '&';
    cookieval += prop + ':' + escape(this[prop]);
  }

/* Now that we have the value of the cookie, put together the 
complete cookie string, which includes the name and the various
attributes specified when the Cookie object was created. 
*/
var cookie = this.$name + '=' + cookieval;
  if (this.$expiration)
      cookie += '; expires=' + this.$expiration.toGMTString();
  if (this.$path) cookie += '; path=' + this.$path;
  if (this.$domain) cookie += '; domain=' + this.$domain;
  if (this.$secure) cookie += '; secure';

  this.$document.cookie = cookie;  // store with magic property
}

function _Cookie_load() {  // cookie load function
/* get a list of all cookies that pertain to this document.
We do this by reading the magic Document.cookie property. 
*/
var allcookies = this.$document.cookie;
  if (allcookies == "") return false;

  // Now extract just the named cookie from that list.
  var start = allcookies.indexOf(this.$name + '=');
  if (start == -1) return false;   // Cookie not defined for this page.
  start += this.$name.length + 1;  // Skip name and equals sign.
  var end = allcookies.indexOf(';', start);
  if (end == -1) end = allcookies.length;
  var cookieval = allcookies.substring(start, end);

/* Now that we've extracted the value of the named cookie, we've
got to break that value down into individual state variable 
names and values. The name/value pairs are separated from each
other by ampersands, and the individual names and values are
separated from each other by colons. We use the split method
to parse everything.
*/
var a = cookieval.split('&');      // array of name/value pairs.
  for(var i=0; i < a.length; i++)  // Break each pair into an array.
      a[i] = a[i].split(':');

/* Now that we've parsed the cookie value, set all the names and values
of the state variables in this Cookie object. Note that we unescape()
the property value, because we called escape() when we stored it.
*/
  for(var i = 0; i < a.length; i++) {
    this[a[i][0]] = unescape(a[i][1]);
  }

  // We're done, so return the success code.
  return true;
}

function _Cookie_remove() {  // the remove method
var cookie;
  cookie = this.$name + '=';
  if (this.$path) cookie += '; path=' + this.$path;
  if (this.$domain) cookie += '; domain=' + this.$domain;
  cookie += '; expires=Fri, 02-Jan-1970 00:00:00 GMT';

  this.$document.cookie = cookie;  // magic store
}


/* Create the cookie we'll use to save state for this web page.
Since we're using the default path, this cookie will be accessible
to all web pages in the same directory as this file or "below" it.
Therefore, it should have a name that is unique among those pages.
Note that we set the expiration to 10 days in the future. 
*/
var cdat = new Cookie(document, "paypalc2", 10);
Cookie.prototype.store  = _Cookie_store;  // load proto methods
Cookie.prototype.load   = _Cookie_load;
Cookie.prototype.remove = _Cookie_remove;

var d = new Date (); // to work with dates
var expire;          // discount expiration code
var percnt;          // discount percent
var copday;          // days left on coupon

if (!cdat.load()) {  // init if we can't load
  cdat.visits = 0;   // assign properties -user visits to page
  cdat.orders = 0;                      // user orders placed
  cdat.discnt = 0;                      // active discount coupon
  cdat.verson = document.lastModified;  // last visited version
}

cdat.visits++;          // bump count of visits to page
if (cdat.visits > 1) {  // Welcome the user back
  document.write ("<h2>Welcome back</h2>");
}
document.write("<p>You have visited ", 
                cdat.visits, " times.</p>");

if (cdat.verson != document.lastModified) {
  document.write ("<p>Page has changed since last visit.</p>");
  cdat.verson = document.lastModified;
}

// Test for an active discount
if (cdat.discnt > 0) {           // may still be good
  var temp = cdat.discnt * 5;    // restore to dddddpp
  percnt = temp % 100;           // the active percent
  expire = ((temp - percnt) / 100) * 86400000; // get ms code
  copday = (expire - d.getTime()) / 86400000;
  if (percnt > 40 ||             // 40% max
      copday > 367 ||            // 1 year max
      expire < d.getTime ()) {   // date expired
    cdat.discnt = 0;
    percnt = 0;
  }
}
if (percnt > 0) {  // show discount active
  document.write ("<p>There is an active coupon with ", 
                  percnt, 
                  "% discount.<br />",
                  copday, " days left on coupon.</p>");
}

cdat.store();  // store to remember updated values


// local functions available to callers

function Whole (arg)  {  // make integer string out of arg
var str,pos;
  str = escape (arg);              // ensure string
  pos = str.indexOf (".");         // look for decimal
  if (pos > 0)                     // found one
    str = str.substring (0, pos);  // lop off extra
  return str;                      // hand back int string
}

function SetDis (day, per) {   // set a discount coupon in cookie
/* The coupon format is dddddpp where ddddd is the day representation
of the MS from getTime() 'till midnight GMT, and pp is the percent of
the discount.  The value is divided by 5 before it is stored in the
cookie, forcing the percent to be a multiple of 5.
*/
var expr,ctim;
  ctim = d.getTime() + d.getTimezoneOffset() * 60000;  // round
  expr = Whole (ctim / 86400000);  // get whole days
  cdat.discnt = Whole ((((expr * 1.0 + day) * 100) + per) / 5.0);
  cdat.store();        // record the cookie
}