function newwindow(w,h,webaddress, winName) {
  var oWin = window.open(webaddress,winName,'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=Yes,resizable=no,copyhistory=no,width='+w+',height='+h);
  oWin.moveTo(screen.availWidth/2-(w/2),screen.availHeight/2-(h/2));
  if(oWin.window.focus) oWin.window.focus();
}