The following simple code doesn't work in IE9.0.8112.16421 and Chrome19.0.1084.46
The Twitter link inside the Share button gets updated, but the stand alone button does not.
<html>
<head>
<script type="text/javascript">
var addthis_share = { url: 'http://www.abc.com', title: 'Old Title',
templates: { twitter: '{{title}}: {{url}}' } };
var addthis_config = { data_track_clickback: false };
function Set() {
addthis.update('share', 'url', "http://www.cnn.com");
addthis.update('share', 'title', "New Title");
}
</script>
</head>
<body>
<div class="addthis_toolbox addthis_default_style">
<p><a href="#" onclick="javascript:Set();">Change</a></p>
<a class="addthis_counter addthis_pill_style"></a>
<a class="addthis_button_tweet"></a>
</div>
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=xa-4fb6a5aa5691e56c"></script>
</body>
</html>
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