Running javascript code on page load, without using the onload tag
<p>How can I run a JavaScript code when the page loads without using the <code>onload</code> tag?</p>

<p>I'm trying to run this script:</p>

<pre><code>&lt;script type="text/javascript"&gt;
function displayLightbox() {
    document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block'
}
&lt;/script&gt;
</code></pre>

<p>That displays a lightbox.</p>
