if (document.images) {
    main_menu0on       = new Image();
    main_menu0on.src   = "img/menu0_on.gif" ;
    main_menu0off     = new Image() ;
    main_menu0off.src = "img/menu0_off.gif" ;
	main_menu1on       = new Image();
    main_menu1on.src   = "img/menu1_on.gif" ;
    main_menu1off     = new Image() ;
    main_menu1off.src = "img/menu1_off.gif" ;
	main_menu2on       = new Image();
    main_menu2on.src   = "img/menu2_on.gif" ;
    main_menu2off     = new Image() ;
    main_menu2off.src = "img/menu2_off.gif" ;
	main_menu3on       = new Image();
    main_menu3on.src   = "img/menu3_on.gif" ;
    main_menu3off     = new Image() ;
    main_menu3off.src = "img/menu3_off.gif" ;
	main_menu4on       = new Image();
    main_menu4on.src   = "img/menu4_on.gif" ;
    main_menu4off     = new Image() ;
    main_menu4off.src = "img/menu4_off.gif" ;
	main_menu5on       = new Image();
    main_menu5on.src   = "img/menu5_on.gif" ;
    main_menu5off     = new Image() ;
    main_menu5off.src = "img/menu5_off.gif" ;
	main_menu6on       = new Image();
    main_menu6on.src   = "img/menu6_on.gif" ;
    main_menu6off     = new Image() ;
    main_menu6off.src = "img/menu6_off.gif" ;
	
	menu1aon       = new Image();
    menu1aon.src   = "img/menu6a_on.gif" ;
    menu1aoff     = new Image() ;
    menu1aoff.src = "img/menu6a_off.gif" ;
	menu1bon       = new Image();
    menu1bon.src   = "img/menu6b_on.gif" ;
    menu1boff     = new Image() ;
    menu1boff.src = "img/menu6b_off.gif" ;
	menu1con       = new Image();
    menu1con.src   = "img/menu6c_on.gif" ;
    menu1coff     = new Image() ;
    menu1coff.src = "img/menu6c_off.gif" ;
	
	menu2aon       = new Image();
    menu2aon.src   = "img/menu5a_on.gif" ;
    menu2aoff     = new Image() ;
    menu2aoff.src = "img/menu5a_off.gif" ;
	menu2bon       = new Image();
    menu2bon.src   = "img/menu5b_on.gif" ;
    menu2boff     = new Image() ;
    menu2boff.src = "img/menu5b_off.gif" ;
	menu2con       = new Image();
    menu2con.src   = "img/menu5c_on.gif" ;
    menu2coff     = new Image() ;
    menu2coff.src = "img/menu5c_off.gif" ;
	menu2don       = new Image();
    menu2don.src   = "img/menu5d_on.gif" ;
    menu2doff     = new Image() ;
    menu2doff.src = "img/menu5d_off.gif" ;
	menu2eon       = new Image();
    menu2eon.src   = "img/menu5e_on.gif" ;
    menu2eoff     = new Image() ;
    menu2eoff.src = "img/menu5e_off.gif" ;
	menu2fon       = new Image();
    menu2fon.src   = "img/menu5f_on.gif" ;
    menu2foff     = new Image() ;
    menu2foff.src = "img/menu5f_off.gif" ;
	
	menu3aon       = new Image();
    menu3aon.src   = "img/menu4a_on.gif" ;
    menu3aoff     = new Image() ;
    menu3aoff.src = "img/menu4a_off.gif" ;
	menu3bon       = new Image();
    menu3bon.src   = "img/menu4b_on.gif" ;
    menu3boff     = new Image() ;
    menu3boff.src = "img/menu4b_off.gif" ;
	menu3con       = new Image();
    menu3con.src   = "img/menu4c_on.gif" ;
    menu3coff     = new Image() ;
    menu3coff.src = "img/menu4c_off.gif" ;
	menu3don       = new Image();
    menu3don.src   = "img/menu4d_on.gif" ;
    menu3doff     = new Image() ;
    menu3doff.src = "img/menu4d_off.gif" ;
	
	menu4aon       = new Image();
    menu4aon.src   = "img/menu3a_on.gif" ;
    menu4aoff     = new Image() ;
    menu4aoff.src = "img/menu3a_off.gif" ;
	menu4bon       = new Image();
    menu4bon.src   = "img/menu3b_on.gif" ;
    menu4boff     = new Image() ;
    menu4boff.src = "img/menu3b_off.gif" ;
}
function menu_off( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "off.src" );
    }
}
function menu_on ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "on.src" );
    }
}