if (document.images) {
     button1 = new Image
     button2 = new Image
	 button3 = new Image
     button4 = new Image
	 button5 = new Image
     button6 = new Image
     button7 = new Image
     button8 = new Image
     button9 = new Image
     button10 = new Image
     button11 = new Image
     button12 = new Image
    
	 button1.src = '/images/btn_menu_1.gif'
     button2.src = '/images/btn_menu_1b.gif'
	 button3.src = '/images/btn_menu_2.gif'
     button4.src = '/images/btn_menu_2b.gif'
	 button5.src = '/images/btn_menu_3.gif'
     button6.src = '/images/btn_menu_3b.gif'
     button7.src = '/images/btn_menu_4.gif'
     button8.src = '/images/btn_menu_4b.gif'
     button9.src = '/images/btn_menu_5.gif'
     button10.src = '/images/btn_menu_5b.gif'
     button11.src = '/images/btn_menu_6.gif'
     button12.src = '/images/btn_menu_6b.gif'
 }