kontrola velkosti databazy - echo link ak sa zmenila

<script>
function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return "";
}

function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}
</script>
<?php

$db_spojenie = mysql_connect("server", "meno", "heslo");
mysql_select_db("oskbudkovce");

vybrat posledny pridany udaj z databazy pre pole datum a priradit ho premennej $datum_db

$datum_db = str_replace("-", "", $datum_db);
$datum_txt = str_replace("-", "", $datum_txt);
$file = 'datum.txt';

$fp = fopen($file, 'r');

$datum_txt=fread($file, filesize("datum.txt"));
if $datum_db > $datum_txt
{
$value1 = '1';
setcookie("datum_cookies", $value);
}
else
{
$value0 = '0';
setcookie("datum_cookies", $value);

}
fclose($fp);

$fp = fopen($file, 'w+');

fputs($fp, $datum_db);

fclose($fp);

if $_COOKIE["datum_cookies"]="1"
{
echo "<input type='hidden' name='datum_cookies' value='0' />Fórum - <a href='odkaz_do_fora.htm' action='javascript:setCookie('clipboard',document.getElementsByName('datum_cookies')[0].value)'> nový príspevok</a>";
}
else
{
echo "Fórum - <a href='odkaz_do_fora.htm'>žiadny nový príspevok [pridať nový]</a>"
}
?>