JS equivalent to php include file

I have tried it using php ie include 'somefile.js'; in the header, however it doesn't work. I was wondering if there's a javascript way of doing it so the file could be called in between the javascript tags in the header. the js data I have to put in another file are a load of vars etc.
ie:
<script type="text/javascript" language="javascript">
var blah blah
....................
function blah blah
</script>

I think there is no real equivalent. As an alternative way you could look at this link.

As long as you reference the vars before you need them, they should be available for subsequent scripts. eg.
inc_test.html

vars.js
header.js
footer.js

EDIT :lol: I just checked out the link Icon posted. Very good!

Thanks Mittineague!

It was just the header info that I was concerned about as the my files which used the same js var were all 'top heavy' if you see what I mean, and now, if there are any changes to be made, I can do it in just one file. Life changing stuff! It's made a big difference. As mentioned before, I was trying to do the same thing before in php, without much success. And, well, thanks Icon for that link, I haven't had time to read in between the lines as yet, I don't get the joke, but I'm sure testing out js includes are humourous!

The article shows some methods, including Mittineagues method I think.

Yeh thanks for that link. I had a chance to read some it. I like the random include which is useful for a selection of advertising banners on my site.