How to include javascript in html5

I can not connect an external JavaScript file to my html page.
When I put the script in the page with the tag it all works
but when I insert it in an external file is not working, what is wrong?

<link href='' rel='stylesheet' type='text/css'>
<!-- JQuery da Google -->
<script language="javascript" type="text/javascript" src=""></script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- CSS -->
<link href="style.css" rel="stylesheet" type="text/css" />
<!-- JS-->
<script src="js/function.js" type="text/javascript"></script>


<img class="info" src="img/newsletter.png" width="32" height="32" alt="info" />

<div id="info">
    <ul class="infomenu">
        <li class="newsletter">NEWSLETTER</li>
        <li>FOLLOW US</li>



    //Jquery Info



Source: javascript

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