Wayne Khan is right in that
the default behavior is to open when you call dialog(), unless you set autoOpen to false.
and tvanfosson has it nearly correct, though the default dialog is not Modal. To display a modal window, you must set the modal
option to true
To illustrate, here's a trimmed-down excerpt from a small project I was working on tonight:
...
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"></script>
<script type="text/javascript" src="./jquery-ui-personalized-1.6rc6.min.js"></script>
<script type="text/javascript" src="./init.js"></script>
<link rel="stylesheet" href="./css.css" type="text/css" />
<script type="text/javascript">
$(function() {
$('#exampleNode').dialog({
modal: 'true'
});
});
</script>
...
For your reference: