using strip_tags() to get rid of sourcecode but ...

Hi,

I get a line of a html page into a string which I want to search throug
later.
Then I use strip_tags($string) to get rid of the sourcecode - works perfekt
exept that it gives back all between <script language="JavaScript">
badanduglysourcecode </script> , too
How can I work around that?

thanks for any help

Rolf