Thank you for your suggestion. I tried subclassing, with no text decoration, but the blue underline remains. I've stripped everything out, all files, down to this code, and the problem is still there:
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
a:link{color:#0563c1;}
a.clkimg {
text-decoration: none;
border="0";
rel="nofollow"
}
</style>
</head>
<body>
<h1>ABOUT THE AUTHOR</h1>
<p>Thank you for reading this story. If you enjoyed it, please share your thoughts.</p>
<p><a class="clkimg" style="text-decoration:none;" href="http://www.amazon.com/Your-Title-ebook/product-reviews/B00ABCDEFG/%E2%80%9D"><img alt="Logo" src="../Images/Amazon-small-quality.com.jpg" /></a></p>
</body>
</html>