Try removing the dangling comma:
$('ul', this).animate({opacity: "show", }, "slow");
so that:
$('ul', this).animate({opacity: "show"}, "slow");
If this does not work, make sure IE is not displaying your page in quirks mode or is using the old rendering engine by running your HML like this:
<!doctype html>
<html lang="en-us">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
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