title: Detect characterSet of a text area using javascript
body: <p>I have a html page that my users can write a text and send as a text message.<br>
  I want to detect the character set of the text that they want to send.<br>
  for example my text is:<br>
  Hi there. ب<br>
  This text will detect as utf-8 in my friend Web Site.<br>
  I want to do this for myself.<br>
  can any body help?<br>
  sorry for bad english.  </p>