Other people's claims notwithstanding, there is an easy way to arrange it.

Send back a page that loads fine without JavaScript, and in it include the following: 

<script>
  document.replace("http://my.company.com/alternate/url");
</script>

[download]
If they have JavaScript then they will be redirected. If not, then they won't.

In reply to Re (tilly) 1: Check for JavaScript Enabled by tilly
in thread Check for JavaScript Enabled by anil_kansal

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