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)
   }