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

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what about a different approach:


<script langauge="JavaScript">
function GoPrevious() {
  if (history.length != 0)

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

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).
you can find out the url that brought the browser to the page by accessing the refferer header in the request.  


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