[jQuery] META Tag

[Glen Lipka]

<meta http-equiv="refresh" content="200;url=http://jquery.com";>

$(document).ready(function(){
 var meta = $("meta").attr("content");
  alert(meta);  //results in 200;url=http://jquery.com

 $("meta").attr("content","500;url=http://commadot.com";);
  alert(meta); //results in same as first
});

Good news.  The first alert works.
Bad news.  The second one doesn't.

Any ideas?

Glen