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I don't see the point of this. You can just set a variable before you embed the JavaScript source file:
<script language="JavaScript"><!-- var myVariable= '123'; //--></script> <script src="http://www.mydomain.com/file.js"></script>
There is only one URL associated with a page - the documents URL. If you were to use:
<script src="test.js?123"></script>
And then in test.js:
alert('Search property = ' + location.search);
all that would happen is the JavaScript would display the search property of the current document and not the URL of the JavaScript source file.