function Cookie() {
  // utility function to retrieve an expiration date in proper
  // format; pass three integer parameters for the number of days, hours,
  // and minutes from now you want the cookie to expire (or negative
  // values for a past date); all three parameters are required,
  // so use zeros where appropriate
  function getExpDate(days, hours, minutes) {
    var expDate = new Date( );
    if (typeof days == "number" && typeof hours == "number" && 
        typeof minutes == "number") {
        expDate.setDate(expDate.getDate( ) + parseInt(days));
        expDate.setHours(expDate.getHours( ) + parseInt(hours));
        expDate.setMinutes(expDate.getMinutes( ) + parseInt(minutes));
        return expDate.toGMTString( );
    }
  }
   
  // utility function called by getCookie( )
  function getCookieVal(offset) {
    var endstr = document.cookie.indexOf (";", offset);
    if (endstr == -1) {
        endstr = document.cookie.length;
    }
    return unescape(document.cookie.substring(offset, endstr));
  }
   
  // primary function to retrieve cookie by name
  this.getCookie = function(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 "";
  }
   
  // store cookie value with optional details as needed
  this.setCookie = function(name, value, expires, path, 
    domain, secure) {
      document.cookie = name + "=" + escape (value) +
        ((expires) ? "; expires=" + expires : "") +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");
  }
   
  // remove the cookie by setting ancient expiration date
  this.deleteCookie = function(name, path, domain) {
    if (getCookie(name)) {
      document.cookie = name + "=" +
          ((path) ? "; path=" + path : "") +
          ((domain) ? "; domain=" + domain : "") +
          "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
  }
}