if ( document.images )
{
  link_01_on = new Image ( );
  link_01_off = new Image ( );

  link_01_on.src = "/images/master/menu_home_over.jpg";
  link_01_off.src = "/images/master/menu_home.jpg";
  
  link_02_on = new Image ( );
  link_02_off = new Image ( );

  link_02_on.src = "/images/master/menu_story_over.jpg";
  link_02_off.src = "/images/master/menu_story.jpg";
  
  link_03_on = new Image ( );
  link_03_off = new Image ( );

  link_03_on.src = "/images/master/menu_explore_over.jpg";
  link_03_off.src = "/images/master/menu_explore.jpg";
  
  link_04_on = new Image ( );
  link_04_off = new Image ( );

  link_04_on.src = "/images/master/menu_teaware_over.jpg";
  link_04_off.src = "/images/master/menu_teaware.jpg";
  
  link_05_on = new Image ( );
  link_05_off = new Image ( );

  link_05_on.src = "/images/master/menu_world_over.jpg";
  link_05_off.src = "/images/master/menu_world.jpg";
  
  link_06_on = new Image ( );
  link_06_off = new Image ( );

  link_06_on.src = "/images/master/menu_contact_over.jpg";
  link_06_off.src = "/images/master/menu_contact.jpg";

  link_07_on = new Image ( );
  link_07_off = new Image ( );

  link_07_on.src = "/images/master/menu_blog_over.jpg";
  link_07_off.src = "/images/master/menu_blog.jpg";
}



function button_on ( imgName ) //link_01
{
  if ( document.images )
  {
    butOn = eval ( imgName + "_on.src" );
    document[imgName].src = butOn;
  }
}

function button_off ( imgName )
{
  if ( document.images )
  {
    butOff = eval ( imgName + "_off.src" );
    document[imgName].src = butOff;
  }
}