/***************************************************
FO_switchMenu.js
Copyright, 2004, FAROUT Corporation, All rights reserved.
http://www.farout.jp/
***************************************************/
function find_object( id ) {
  if ( document.getElementById ) { return document.getElementById( id ); }
  if ( document.all            ) { return document.all( id ); }
  if ( document.layers         ) { return document.layers[ id ]; }
}

function swap_image( img_id, menu_id, basename, status ) {
  obj  = find_object( img_id );
  menu = find_object( menu_id );
  obj.src = basename + ( menu.style.display == 'none' ? '' : '_on' ) + ( status == 'over' ? '_ov' : '' ) + '.gif';
}

function switch_menu_visible( img_id, menu_id, basename ) {
  obj = find_object( menu_id );
  obj.style.display = obj.style.display == 'none' ? 'block' : 'none';
  swap_image( img_id, menu_id, basename, 'over' );
}