Could anyone please tell me what a valid argument would be in this script?

error message
Warning: Invalid argument supplied for foreach() in 
/home1/domains/$domain/htdocs/image.php on line 334






line 323-343


$dg = opendir("$thumb");
echo "<HTML><HEAD><TITLE>$title</TITLE><META NAME=Description CONTENT='Page Generated 
with ScriptCoders AutoThumbs V2.01 http://www.scriptcoders.com'></HEAD>";
PrintHeader();
echo "<center><br><img src=/content/images/br.gif><br><br>";
echo "<center><table border=0 width=90% ALIGN=CENTER VALIGN=CENTER><tr ALIGN=CENTER 
VALIGN=CENTER><td ALIGN=CENTER VALIGN=CENTER>";
while ( gettype($file = readdir($dg)) != boolean )
    {
    if (! is_dir("$file")) 
$retVal[count($retVal)] = $file;
}
closedir($dg); 
foreach ($retVal as $newFile)
if ($newFile != ".htaccess")
{
$li = ($li + 1);
    /*if (!isset($user)) {
  echo "<a href=$PHP_SELF?image=$newFile><img src=\"$thumb/$newFile\" width=\"50\" 
height=\"50\" border=1 ALIGN=CENTER VALIGN=CENTER></a>&nbsp;&nbsp;";
    }
 else if (isset($user)) {*/
          echo "<a href=$PHP_SELF?image=$newFile><img src=\"$thumb/$newFile\" border=1 
ALIGN=CENTER VALIGN=CENTER></a>&nbsp;&nbsp;";
    //}

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