function  createCookie( name, value, days )
  {
        if   (days)  {
            var  date = new  Date();
            date.setTime( date.getTime() + (days * 24 * 60 * 60 * 1000) );
            //date.setTime( date.getTime() + (sec * 1000) );
            var  expires = "; expires="+date.toGMTString();
        }
        else   var  expires = "";
        document.cookie = name + "=" + value + expires + "; path=/";
  }

function  readCookie( name )
  {
        var  nameEQ = name + "=";
        var  ca = document.cookie.split( ';' );
        for  (var i=0; i<ca.length; i++)  {
                var  c = ca[i];
                while  (c.charAt( 0 ) == ' ')  c = c.substring( 1, c.length );
                if  (c.indexOf( nameEQ ) == 0)   return  c.substring( nameEQ.length, c.length );
        }
        return  null;
  }


function  eraseCookie( name )
  {
        createCookie( name, "", -1 );
  }