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<script type="text/javascript" src="foo.js"></script>

<script>var version_of_foo_must_be = 2.37;</script>
<script type="text/javascript" src="foo.js"></script>

var what_version_i_am = 2.36;
if (what_version_i_am<version_of_foo_must_be) {
  // scream and panic
}