[jQuery] jQuery works in one place but not another

[jQuery] jQuery works in one place but not another


I'm observing some strange behavior with jQuery 1.2.6 today. I've got
this in my <head>
<script type="text/javascript" src="/scripts/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function () {
alert('this works');
});
function showFilterCalendar() {
$('h2').fadeOut('slow');
// don't follow the link
return false;
}
</script>
When the page loads, I get the alert box saying "this works."
However, when I click a link like <a href="#"
onclick="javascript:return showFilterCalendar()">test</a>, I get the
infamous "$ is not a function" error.
Ideas?