How to hide / encrypt CCK Email field with JS against spammer

I got headche while searching for a filter to encrypt/hide email cck field to protect email addresses from spambots. I have installed , deinstalled, activated-deactivated rearranged input filters with both invisimail and spamspan but no luck! Finally I decide to change code in email.module. It works! Go and open "sites/all/modules/email/email.module" and find the line 115 like this:

/**
 * Theme function for 'default' email field formatter.
 */
function theme_email_formatter_default($element) {
  return !empty($element['#item']['safe']) ? '<a href="mailto:'. $element['#item']['email'] .'">'. $element['#item']['safe'] .'</a>' : '';
}

replace line 118-120 with following

function theme_email_formatter_default($element) {

$str = trim( $element['#item']['safe'] );
if( !$str ) return;

for($i=strlen($str)-1; $i>-1; $i--) { $arr[] = "'".substr($str, $i, 1)."'"; }

$js_arr2str = implode(", ", $arr);

return <<<hrd
	<script language="javascript" type="text/javascript">
		var em_real = [$js_arr2str], em_safe_str = "";
		for(i=em_real.length-1; i>-1; i--){ em_safe_str += em_real[i];	}
		document.write('<a hr'+'ef="mai'+'lto:'+em_safe_str+'">'+em_safe_str+'</a>');
	</script>
hrd;

}