<script> tags being replaced

In the app that i'm wirting, I have legacy text that is being loaded into the editor that sometimes contains <script></script> tags.

when this text is resubmitted, the tags and the content is being replaced with <!--{PS..0}-->.

I've tried setting

FCKConfig.EnableXHTML = false ;
FCKConfig.EnableSourceXHTML = false ;

but this does not help.

Anyone encounter this and able to fix it?