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    <p>There is the <strong><a href="http://www.websiteoptimization.com/speed/tweak/defer/" rel="noreferrer"><code>defer</code> attribute</a></strong> you could put on script blocks to defer its execution until the page completes loading.</p> <pre><code>&lt;script src="myscript.js" type="text/javascript" defer&gt; // blah blah &lt;/script&gt; </code></pre> <p>I am not sure about the general recommendation about using this attribute though.</p> <p><strong>EDIT:</strong> As @David pointed out, use <code>defer="defer"</code> for XHTML</p> <p>And you can always put the code inside the <strong><code>window.onload</code></strong> event so that it executes <em>after</em> the pages load:</p> <pre><code>window.onload = function () { // ad codes here }; </code></pre> <p>But the later approach may pose some problems, you might want to test it out first.</p> <p>More information on <a href="http://dean.edwards.name/weblog/2005/09/busted/" rel="noreferrer">this blog post</a> by Dean Edwards, the guy who wrote the famous <a href="http://dean.edwards.name/packer/" rel="noreferrer">javascript packer</a>.</p> <hr> <p><strong>EDIT:</strong> If the size of ad code itself is the problem, you can always defer the loading by combining the above methods with script injection via <code>document.write</code>:</p> <pre><code>function loadScript(src) { document.write('&lt;script src="' + src + '" type="text/javascript"&gt;&lt;/script&gt;'); } </code></pre> <p>So the resulting code might look something like this:</p> <pre><code>&lt;script type="text/javascript" defer&gt; function loadScript(src) { document.write('&lt;script src="' + src + '" type="text/javascript"&gt;&lt;/script&gt;'); } loadScript('http://ads.example.com/advertisements.js'); &lt;/script&gt; </code></pre> <p>But as I've said, it depends on the specific ad code you get too. Because of the position <code>document.write</code> will write stuffs to might not be the location you want. Some modifications might be neccessary.</p>
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    1. POIs it possible to load a javascript ad last on the page to prevent slow load times?
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    1. COThanks for the reply! I tried this and it worked well.
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    2. COIf you are targeting XHTML, be sure to use defer="defer" rather than just defer.
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    3. COWhat a great answer! +1
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