if (document.images) {
 menu1off = new Image; menu1on = new Image;
 menu2off = new Image; menu2on = new Image;
 menu3off = new Image; menu3on = new Image;
 menu4off = new Image; menu4on = new Image;
 menu5off = new Image; menu5on = new Image;
 menu6off = new Image; menu6on = new Image;
 menu1off.src = 'images/menu_1_off.gif'; menu1on.src = 'images/menu_1_on.gif';
 menu2off.src = 'images/menu_2_off.gif'; menu2on.src = 'images/menu_2_on.gif';
 menu3off.src = 'images/menu_3_off.gif'; menu3on.src = 'images/menu_3_on.gif';
 menu4off.src = 'images/menu_4_off.gif'; menu4on.src = 'images/menu_4_on.gif';
 menu5off.src = 'images/menu_5_off.gif'; menu5on.src = 'images/menu_5_on.gif';
 menu6off.src = 'images/menu_6_off.gif'; menu6on.src = 'images/menu_6_on.gif';
}