Why doesn’t this javascript string code work in internet explorer 7?

I have the following code that works fine in IE8, firefox, chrome but not in IE7

Can someone please explain why this code below doesn’t work in IE7 ?

  var id = $  (this).attr("id");
  var nextStep = id[id.length - 1];

basically, IE7 doesn’t seem to understand this line:

   id[id.length - 1]

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