if(navigator.appVersion.charAt(0) >= "3") {
 var img = new Array();
 
 img[1] = new Image();  img[1].src = "images/nannini/but_top.gif";
 img[2] = new Image();  img[2].src = "images/nannini/but_top2.gif";
 img[3] = new Image();  img[3].src = "images/nannini/but_rest.gif";
 img[4] = new Image();  img[4].src = "images/nannini/but_rest2.gif";
 img[5] = new Image();  img[5].src = "images/nannini/but_access.gif";
 img[6] = new Image();  img[6].src = "images/nannini/but_access2.gif";
 img[7] = new Image();  img[7].src = "images/nannini/but_sitemap.gif";
 img[8] = new Image();  img[8].src = "images/nannini/but_sitemap2.gif";
 img[9] = new Image();  img[9].src = "images/nannini/but_theo.gif";
 img[10] = new Image();  img[10].src = "images/nannini/but_theo2.gif";

    }
function _in(nam,num) {
if(navigator.appVersion.charAt(0) >= "3") {
 document.images[nam].src = img[num].src;
   } else { }
	}
function _out(nam,num) {
 document.images[nam].src = img[num].src;
	}