function mostra(form){
var x = new Array();
var y = new Array();
var name = navigator.appName;
if(name == "Microsoft Internet Explorer") name = true;
else name = false;
var Xm = screen.width;
var Ym = screen.height;

   if(name!=true){
                         alert(" La funzione è attiva solo con INTERNET EXPLORER");
                         return
                         }     
                                                        
var ofsetx = 72;
var ofsety = 90; 
//zz=prompt(" schermo = "+Xm+"  " +Ym);


var k =form.punto.selectedIndex;

x[0]=706;
y[0]=240;
x[1]=673;
y[1]=249;
x[2]=699;
y[2]=215;
x[3]=677;
y[3]=209;
x[4]=535;
y[4]=176;
x[5]=568;
y[5]=164;
x[6]=522;
y[6]=177;
x[7]=563;
y[7]=216;
x[8]=557;
y[8]=177;
x[9]=529;
y[9]=182;
x[10]=499;
y[10]=179;
x[11]=498;
y[11]=219;
x[12]=497;
y[12]=190;
x[13]=469;
y[13]=185;
x[14]=459;
y[14]=210;
x[15]=388;
y[15]=151;
x[16]=351;
y[16]=212;
x[17]=339;
y[17]=185;
x[18]=360;
y[18]=188;
x[19]=344;
y[19]=200;




 Xp = x[k];
 Yp = y[k]; 
 
 if(name) {
img.style.left = Xp-ofsetx;
img.style.top = Yp-ofsety;
             }
 else {
document.img.pageY = Xp-ofset;
document.img.pageX = Yp-ofset;             
         }   

}