function get_cookie ( cookie_name )
{
    var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

    if ( results )
        return ( unescape ( results[2] ) );
    else
        return null;
}
 
function delete_cookie ( cookie_name )
{
    var cookie_date = new Date ( );  // current date & time
    cookie_date.setTime ( cookie_date.getTime() - 1 );
    document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}

function set_cookie ( name, value, exp_y, exp_m, exp_d, path, domain, secure )
{
    var cookie_string = name + "=" + escape ( value );

    if ( exp_y )
    {
        var expires = new Date ( exp_y, exp_m, exp_d );
        cookie_string += "; expires=" + expires.toGMTString();
    }

    if ( path )
        cookie_string += "; path=" + escape ( path );

    if ( domain )
        cookie_string += "; domain=" + escape ( domain );
  
    if ( secure )
        cookie_string += "; secure";
  
    document.cookie = cookie_string;
}