Xsl problem : allow only ceratin html tags

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XSLT

Hi All,
I am stuck with a xsl implementation. I am trying to write a xsl block which would allow only a selected few ‘html’ tags. i.e. allow a tags, bold etc…but not everything like script, table…whatever…

For eg: the string below :

<script> alert(123); </script> 
Enter some text here link or an attachment.
 what is your name 
<br />
<hr />

Xsl transformation should strip out script, hr, br tags and not tag. I can not use disable-output-escaping="yes" as it allows html for whole string :(