how to replace Head script using Greasemonkey code
<p>i want to replace "script.js" to "demo.js". anyone please help me</p>

<pre><code>&lt;head&gt;

    &lt;script src="script.js" type="text/javascript" language="javaScript"&gt;&lt;/script&gt;     

&lt;/head&gt;
</code></pre>