function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function apriMappa(urlMappa) {
	var WW=670;
	var WH=370;
	var WX=screen.availWidth/2-WW/2;
	var WY=screen.availHeight/2-WH/2;
	
	MM_openBrWindow(urlMappa, "visualizzaMappa","width="+WW+",height="+WH+",top="+WY+",left="+WX+",location=no,menubar=no,resizable=no,scrollbars=yes,status=yes");
	
	return false;
}