Počítadlo návštěv-přičte se mi 1 po aktualizaci stránky

<?
function GetHits()
{
    $datadir = "f:\\work\\counter\\";      
                                            
    $datafile = StrTR($GLOBALS["SCRIPT_NAME"], "./\\", "___");
      
    $filename = $datadir.$datafile.".dat";    


    if (File_Exists($filename)):          
        $fp = @FOpen($filename, "r+");        
        if (!$fp) return;    
        $hits = FGetS($fp,10) + 1;       
        Rewind($fp);                        
    else:
        $fp = @FOpen($filename, "w");       
        if (!$fp) return;        
        $hits = 1;                         
    endif;

    FPutS($fp, $hits);                    
    FClose($fp);                            
    echo $hits;                             
}
GetHits();
?>