var Cookie = function(name, value, path, expires, domain, secure)
{
   this.Name = name;
   this.Value = value;
   this.Path = path;
   this.Expires = expires;
   this.Domain = domain;
   this.Secure = secure;
}

Cookie.prototype.MaxSize = 4000; //size in KB

Cookie.prototype.toString = function()
{
   return this.Value;
}

Cookie.prototype.Append = function(newValue)
{
   this.Value += newValue;
}

Cookie.prototype.$GetValue = function( startIndex )
{  
   var endIndex = document.cookie.indexOf( ";", startIndex );  
   if (endIndex == -1)    
      endIndex = document.cookie.length;
   var cookieValue = document.cookie.substring(startIndex, endIndex);
   if (cookieValue == "")
      return null;
   else
      return unescape( cookieValue );
}

Cookie.prototype.Load = function()
{  
   var arg = this.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 )
      {
         this.Value = this.$GetValue(j);
         return this.Value;
      }
      i = document.cookie.indexOf( " ", i ) + 1;    
      if( i == 0 ) break;   
   }  
   
   return null;
}

Cookie.prototype.Save = function()
{
   var newCookie = this.Name + "=" + escape(this.Value) +
   ((this.Expires == null) ? "" : ("; expires=" + this.Expires)) +
   ((this.Path == null) ? "" : ("; path=" + this.Path)) +
   ((this.Domain == null) ? "" : ("; domain=" + this.Domain)) +
   ((this.Secure == true) ? "; secure" : "");
   
   if( newCookie.length > Cookie.MaxSize )
      throw Error("Cookie length was " + newCookie.length + "kb but cookies cannot exceed " + Cookie.MaxSize + "kb");
   
   document.cookie = newCookie;
}

Cookie.prototype.Delete = function()
{  
   var exp = new Date();  
   exp.setTime(exp.getTime() - 1);
   document.cookie = this.Name + "=null;expires=" + exp.toGMTString();
}