Redirecting to another page when a 404 error occurs or file not found

I am building a string in a web page based on criteria outlined in drop down controls.  This sting will correspond with the name of a file that will be uploaded to a web folder through another process.  If the process does not find the file it currently gives a 404 error.  I would like to write an if statement in the code that if the file isn't there, then display another page.  The current function to find the file is below.

<script language="javascript">
function showFileName()
{
  window.location= "http://domain/documents/ProgressReports/" +yr.value + mth.value + day.value + typ.value + ".txt" ;
}
</script>
wymercAsked:
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radnorCommented:
With JS, you cannot test for a file.  If you want something other than the standard 404 error, look into .htaccess file.  Here you can display a page instead of the normal 404 error.

http://www.javascriptkit.com/howto/htaccess2.shtml
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