When I try to add a script to the text widget, it doesn't work or gets deleted when saved.

Hello,

I have been trying to add some code to my text widget so that it pulls from mailchimp the number of subscribers that I have to my blog. When I past the code into the text widget, it disappears when I save it. As well, I tried to paste it into a page in the text editor but it didn't show up. You can see my text widget in the sidebar at the bottom, labeled "Subscriber Count".

Here is the website: http://www.rethinkingcatholicism.com

Here is the code:

<div class="chimpchiclet">
  <script language="JavaScript" src="http://us4.list-manage.com/subscriber-count?
    b=2&u=faa8eb4ef3a111cef92c4f3d4&id=130981" type="text/javascript">
  </script>
</div>

Thanks so much for the help!

Best regards.