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How do I customize the number of Diggs it takes to be considered "popular?"

In future versions, this will be added as an option to the plug-in in your dashboard. In the meantime, you can manually change this value in the "check-digg-stats.php" page.

Look for the declaration of $minDiggs. It should be set to 10. Change '10' to whatever value you want to use as a benchmark.

Do I have to link to prototype.js again if I'm already using it?

No. As long as you have a site-wide link in to the external javascript file prototype.js, you can comment out the line in the plug-in that adds a reference to it.

Open "wp-digg-conditional.php". Scroll down to about line 37. Comment out the line that creates a javascript element with src "$root . '/wp-content/plugins/wp-digg-conditional/prototype.js".

Can I see it in action, please?

Sure. This article on PHP image functions has enough Diggs to get a badge.

How can I get an answer to a new question?

If you have a problem, question, or feature request, you can send them my way and I'll deal with them when I have the time.

The easiest way would be to go to the plug-in homepage and leave a comment.