Vote script(php)-problem?

Hello
Naredu sem eno skripto za glasovanje.
Problem pa je ta, da ko sem skripto testiral v PHPEd programu mi je delal kot bi moralo, a ko sem jo dal na net, mi je vrglo ven error.
Pa tudi štet noče glasov.

Izpiše mi pa tole:

Warning: fopen(plus.txt): failed to open stream: Permission denied in /home/dat1/public_html/votes.php on line 38
Warning: fputs(): supplied argument is not a valid stream resource in /home/dat1/public_html/votes.php on line 40
Warning: fclose(): supplied argument is not a valid stream resource in /home/dat1/public_html/votes.php on line 41
Warning: fopen(neg.txt): failed to open stream: Permission denied in /home/dat1/public_html/votes.php on line 45
Warning: fputs(): supplied argument is not a valid stream resource in /home/dat1/public_html/votes.php on line 46
Warning: fclose(): supplied argument is not a valid stream resource in /home/dat1/public_html/votes.php on line 47

kaj moram spremeniti?

plus.txt in neg.txt nista označena z read-only, niti z hidden.
Saj ne smeta bit, ker se v njih zapisuje št. glasovanja.
Pol se pa iz obeh naredijo procenti za odgovore.

Ka mi je za narediti?

chmod +plus.txt
chmod +neg.txt
?

tu je del skripte, v kateri prikaže error:
if(isset($_POST['vote'])){
if (!empty($_POST['vote'])){
$vote = $_POST['vote'];
if($vote == "yes") {
$votegd = "plus.txt";
$votebd = "neg.txt";
$abab = "Da";
$baba = "Ne";
} elseif($vote == "no") {
$votegd = "neg.txt";
$votebd = "plus.txt";
$abab = "No";
$baba = "Yes";
} else {
echo "Sorry there was an error.";
}
$fp = fopen($votegd,"r");
$numa = fgets($fp,9999);
fclose($fp);
$fp = fopen($votegd,"w");
$numa += 1;
fputs($fp, $numa);
fclose($fp);
$fpb = fopen($votebd,"r");
$numb = fgets($fpb,9999);
fclose($fpb);
$fpb = fopen($votebd,"w");
fputs($fpb, $numb);
fclose($fpb);
$a = $numa;
$b = $numb;
$num = $a + $b;
$numaa = round($a/$num * 100);
$numbb = round($b/$num * 100);
$anumaa = round($a/$num * 300);
$anumbb = round($b/$num * 300);
$numnum = $a + $b;