I have some code specific to sorting tables. Since the code is common in most pages I want to make a JS file which will have the code and all the pages using it can reference it from there. 

Problem is: How do I add jQuery, and table sorter plugin into that .js file?

I tried something like this:

```
document.writeln('<script src="/javascripts/jquery.js" type="text/javascript"></script>');
document.writeln('<script type="text/javascript" src="/javascripts/jquery.tablesorter.js"></script>');

```

but this seems to not work. 

What is the best way to do this?