// JavaScript Document
var win = null;

function closeWin(){
  if (win != null){
    if(!win.closed)
      win.close();
  }
}

function NewWindow(mypage,myname,w,h,scroll) {
  closeWin();
  LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
  TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
  settings = ' height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+' ';
  win = window.open(mypage, myname, settings)
  win.focus()
}