function guvenlik($q) {
$q = str_replace("<","",$q);
$q = str_replace(">","",$q);
$q = str_replace("%","",$q);
$q = str_replace("'","",$q);
$q = str_replace(")","",$q);
$q = str_replace("(","",$q);
$q=trim($q);
return $q;
}