var app = navigator.appName.charAt(0);
var ver = navigator.appVersion.charAt(0);
function spreadwin(url){
  if ( (app == "N" && ver > 2) || (app == "M" && ver > 3) ) {
  window.open(url,"spread","menubar=no,location=no,directories=no,status=no,scrollbars=no,resizable=no,width=450,height=600,left=0,top=20");
  return false;
  } else {
    return true;
  }
}