function PopupCenter(pageURL,title,w,h) 
{
  var left = (screen.width/2)-(w/2);
  var top = (screen.height/2)-(h/2);
  //0 => no
  //1 => yes
  var args = "";
  args += "width=" + w + "," + "height=" + h + ","
		+ "location=0,"
		+ "menubar=0,"
		+ "resizable=0,"
		+ "scrollbars=0,"
		+ "statusbar=false,dependent,alwaysraised,"
		+ "status=false,"
		+ "titlebar=no,"
		+ "toolbar=0,"
		+ "hotkeys=0,"
		+ "screenx=" + left + ","  //NN Only
		+ "screeny=" + top + ","   //NN Only
		+ "left=" + left + ","     //IE Only
		+ "top=" + top;            //IE Only
        // fullscreen=yes, add for full screen

  myWin = window.open(pageURL, "MathMechanixs", args); // WARNING: no spaces are allowed in the title
  //myWin = window.open(pageURL,"MathMechanixs", 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width=' + w + ', height=' + h + ', top=' + top + ', left=' + left);
  myWin.focus();
  //window.showModalDialog(pageToLoad,"","dialogWidth:650px;dialogHeight:500px");
} 

function ClosePopup()
{
  if ((myWin != null)&&(!myWin.closed))
  {
    myWin.self.close()
  }
}