// create pop-up window

var popupWindow
function createNew(URL, w, h) {
  if (!popupWindow || popupWindow.closed) {
    popupWindow = window.open(URL,"_blank",'HEIGHT='+h+',WIDTH='+w+',scrollbars=1,resizeable=yes,toolbar=0,location=0,menubar=0')
  } else{
    //bring existing subwindow to the front
    popupWindow.focus()
  }
}