Referring page issue

[valleydr 0]

I have this little snippet of code:

[code]

<?php $referrer = $_SERVER['HTTP_REFERER'];
          if($referrer == "http://www.mysite.com/search/compare.php"){
        echo "<form name=\"compForm\" method=\"POST\" action=\"compare.php\"><input type=\"submit\" name=\"Submit\" value=\"View Favorites\" style=\"font-size:11px; font-family:Arial, Helvetica, sans-serif; color:#000000; border-width:0px; background-color:#FFFFFF; border-color:#FFFFFF\" /></form>";
        }else{
        echo "<a href=\"javascript:history.back();\" style=\"color:#000000; text-decoration:none\"> Back to Results</a>";}
?>

[/code]

So if I click on a link from compare.php to the page holding this code, the form button should show up instead of the java Back button. It worked fine yesterday, but suddenly it only shows the java button, and not the form button when coming from compare.php. Can anyone see this problem?