/*
Apre un PopUp al centro dello schermo
Compatibile con:
IE 6.0 +
Mozilla 1.5 +
NetScape 7.1 +
*/
function PopUp_Center(url, name, width, height, scrollbars) 
{
  var str = "height=" + height + ",innerHeight=" + height;
  str += ",width=" + width + ",innerWidth=" + width;

  if (window.screen) 
		{
			var ah = screen.availHeight - 30;
			var aw = screen.availWidth - 10;
			var xc = (aw - width) / 2;
			var yc = (ah - height) / 2;

			str += ",left=" + xc + ",screenX=" + xc;
			str += ",top=" + yc + ",screenY=" + yc;
			str += ",scrollbars= " + scrollbars + ",resizable=no,status=no";
  }

  window.open(url, name, str).focus();
}