var win= null;
function NewWindow(mypage,myname,w,h,scroll){
var winl = (screen.width-w)/2;
var wint = (screen.height-h)/2;
var settings  ='height='+h+',';
      settings +='width='+w+',';
      settings +='top='+wint+',';
      settings +='left='+winl+',';
      settings +='scrollbars='+scroll+',';
      settings +='resizable=yes';
      win = window.open(mypage, myname, settings);
      if (win != null) {
          if (parseInt(navigator.appVersion, 10) >= 4) { win.window.focus(); }
      }     
}
window.name = 'main';