if (document.images) {
     butt1 = new Image
     butt2 = new Image
	 butt3 = new Image
	 butt4 = new Image
	 butt5 = new Image
	 butt6 = new Image
	 butt7 = new Image
	 butt8 = new Image
	 butt9 = new Image
	 butt10 = new Image
	 butt11 = new Image
	 butt12 = new Image
	 butt13 = new Image
	 butt14 = new Image
	 butt15 = new Image
	 butt16 = new Image
	 butt17 = new Image
	 butt18 = new Image
	 butt19 = new Image
	 butt20 = new Image
	 butt21 = new Image

     butt1.src = 'images/mappa_it.gif'
     butt2.src = 'images/ita1.gif'
	 butt3.src = 'images/ita2.gif'
	 butt4.src = 'images/ita3.gif'
	 butt5.src = 'images/ita4.gif'
	 butt6.src = 'images/ita5.gif'
	 butt7.src = 'images/ita6.gif'
	 butt8.src = 'images/ita7.gif'
	 butt9.src = 'images/ita8.gif'
	 butt10.src = 'images/ita9.gif'
	 butt11.src = 'images/ita10.gif'
	 butt12.src = 'images/ita11.gif'
	 butt13.src = 'images/ita12.gif'
	 butt14.src = 'images/ita13.gif'
	 butt15.src = 'images/ita14.gif'
	 butt16.src = 'images/ita15.gif'
	 butt17.src = 'images/ita16.gif'
	 butt18.src = 'images/ita17.gif'
	 butt19.src = 'images/ita18.gif'
	 butt20.src = 'images/ita19.gif'
	 butt21.src = 'images/ita20.gif'
 }