function ZoomImg(img,pagina,incremx,incremy){
  var clientHt = window.screen.height;
  var clientWt = window.screen.width;	
  foto1= new Image();
  foto1.src=(img);
  largh=foto1.width + incremx;
  altez=foto1.height + incremy ;
  if((foto1.width!=0)&&(foto1.height!=0)&&(largh < clientWt - 20)&&(altez < clientHt - 20))
  {
    stringa="width="+largh+",height="+altez+",resizable=no,location=no, toolbar=no, menubar=no";
	finestra=window.open(pagina,"",stringa);
	finestra.moveTo( (clientWt/2)-(largh/2) , (clientHt/2)-(altez/2));
  }
 }