Want to Replace Some JavaScript with a String

Want to Replace Some JavaScript with a String

I have Some Text Like
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec
condimentum pretium nisl. Integer quis tellus nec turpis placerat
scelerisque.
And I have a JavaScript Like
<script language="javascript1.1"
src="http://www.example.com?id=123&amp;msg=how are you"></script>
This Script is also String for me. So how can i replace this JS with
adipiscing
My Output should be like this:
Lorem ipsum dolor sit amet, consectetuer < script language="javascript1.1"
src="http://www.example.com?id=123&msg=how are you">< /script> elit. Donec
condimentum pretium nisl. Integer quis tellus nec turpis placerat
scelerisque.
Please, someone let me know the JavaScript for This Problem.