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Your HTML page that you wish to include all the Javascript into:

...
<html>
<head>
<? include "scripts.htm"; ?>
...
</head>
<body>
...
</body>
</html>

scripts.htm:

<script type="text/javascript" src="blah1.js"></script>
<script type="text/javascript" src="blah2.js"></script>
<script type="text/javascript" src="blah3.js"></script>