function openWindow(file)
	{
	var shiftAlto=(screen.height-790)/2;
	var shiftSinistra=(screen.width-1010)/2;
	open (file, "new", "height=710, width=1010, scrollbars=0, resizable=1, status=0, menubar=0, toolbar=0, left="+shiftSinistra+", top="+shiftAlto+"");
	}