var win = null;
function NewWindow(mypage,myname,w,h,scroll){
  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+',resizable'
  win = window.open(mypage,myname,settings)
  if(win.window.focus){win.window.focus();}
}