What's wrong with this code? (history.previous)

Here's the objective of the code: If this page was accessed by a link, the errorurl is set to the page that accessed it (history.previous) if this page was accessed without a previous link, errorurl is set to the current URL.

errorurl = history.previous
if(errorurl==undefined) errorurl = window.location

Thanks
LVL 15
Timbo87Asked:
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CodescripterCommented:
what about a different approach:

<html><head><title>test</title>

<script langauge="JavaScript">
function GoPrevious() {
  if (history.length != 0)
    window.history.back();
  else
    window.location.reload();
}
</script>
</head>

<body>
<form name="theform">
<input type="button" value="Previous" onclick="javascript:GoPrevious();">
</form>

</body></html>
Timbo87Author Commented:
Thanks for the answer, but I don't want the browser page to change. I need to it to receive information. It's for a server error handler (404, 500, etc) and if they clicked a link and got a 404, I want it to report the page that they came from (history.previous). If they typed it in (no history) and got the error, I want it to display the page URL they typed in (window.location).
incongruentCommented:
you can find out the url that brought the browser to the page by accessing the refferer header in the request.  


<script>
document.write(document.referrer);
</script>

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incongruentCommented:
**  document.referrer.value **  
Timbo87Author Commented:
Thanks.
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