calling java script from file vs. on page?

What is the proper syntax to be able to offload a java script to a separate file instead of it being embedded in the html code for a page.

 

<script src="filename.js" type="text/javascript"></script>

HTML:

 

Now, inside that file do i still need the <script> </script> tags? Or do the tags in this line of code take care of that?

 

Nope, you don't need them.