function set_cookie ( name, value, expires_year, expires_month, expires_day, path, domain, secure )
{
  var cookie_string = name + "=" + escape ( value );

  if ( expires_year )
  {
    var expires = new Date ( expires_year, expires_month, expires_day );
    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;

}

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

  if ( results )
    return ( unescape ( results[2] ) );
  else
    return null;
}
/*
if ( ! get_cookie ( "username" ) )
{
  var username = prompt ( "Please enter your name", "" );

  if ( username )
  {
    var current_date = new Date;
    var cookie_year = current_date.getFullYear ( ) + 1;
    var cookie_month = current_date.getMonth ( );
    var cookie_day = current_date.getDate ( );
    set_cookie ( "username", username, cookie_year, cookie_month, cookie_day );
    document.location.reload( );
  }
}
else
{
  var username = get_cookie ( "username" );
  document.write ( "Hi " + username + ", welcome to my website!" );
  document.write ( "<br><a href=\"javascript:delete_cookie('username'); document.location.reload( );\">Forget about me!</a>" );
}
*/