function one_finestra(str,altezza,larghezza){
	var winl = (screen.width - 790) / 2;
	var wint = (screen.height - 590) / 2;
    var newWindow = window.open(str,'startweb','height=590,width=790,top='+wint+',left='+winl+',scrollbars=yes, resizable=yes');
}