i am unable to validate the empty fields and scripts

i want to flash an error messege whenever someone tries to add any php
or javascript on the comments tag on any image on my website. i have
stripped the scripts but now it is adding an empty comment on the
comments field rather than displaying an error messege.

this is my strip script beforevalidate in the model

function beforeValidate () {
App::import('Core','Sanitize');
$clean = Sanitize::stripScripts($this->data['Comment']
['comment']);
$clean = Sanitize::stripWhitespace($clean);
$this->data['Comment']['comment']= $clean;
if(strlen($clean)==0){
return false;
}
else return true;
}

and here is my validation

var $validate = array(
'comment' => array(
'rule' => 'notEmpty',
'required' => true,
'message' => 'Comment Field Cannot be empty'));

can any one suggest me the solution??

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