I need real help with this one guys!

I have the following code for my users to place on their site, which displays some HTML from an external js file:

<SCRIPT LANGUAGE="javascript1.1" src="http://xnames.homepagenames.com/xnames2.js"></SCRIPT>
That is all fine and very simple, but...

I need to tell the js file to add a variable at certain places in the HTML code it creates. And that variable needs to be passed from the code above.

I tried the following, but that didn't work:

<SCRIPT LANGUAGE="javascript1.1" SRC="http://xnames.homepagenames.com/xnames.js">
var affid = "joelmoss";  
Can someone please help?