navigator.sayswho = (->
  ua = navigator.userAgent
  tem = undefined
  M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) or []
  if /trident/i.test(M[1])
    tem = /\brv[ :]+(\d+)/g.exec(ua) or []
    return "IE " + (tem[1] or "")
  if M[1] is "Chrome"
    tem = ua.match(/\bOPR\/(\d+)/)
    return "Opera " + tem[1]  if tem?
  M = (if M[2] then [
    M[1]
    M[2]
  ] else [
    navigator.appName
    navigator.appVersion
    "-?"
  ])
  M.splice 1, 1, tem[1]  if (tem = ua.match(/version\/(\d+)/i))?
  M.join " "
)()