Javascript beveileging op site!

<script language="JavaScript"> document.location='http://www.blabla.nl/'; </script>

<script language="JavaScript"> document.location='http://www.blabla.nl/'; </script>

if($_POST['onderwerp'] == '') {
   //dat doen
}
else {
   //dat doen
}

if($_POST['onderwerp'] == '') {
   //dat doen
}
else {
   //dat doen
}

$var  = preg_replace("/(<.*?>\s*.*\s*<\/.*?>)/" , "", $var);

$var  = preg_replace("/(<.*?>\s*.*\s*<\/.*?>)/" , "", $var);