WordPress and jQuery UI

I like to know if there 开发者_高级运维is already installed in WordPress the jQuery UI for the administration panel.

If not then I have to load it.

If is loaded how can I use it ?

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You can include jquery by including the following in header.php

<?php 
wp_enqueue_script("jquery");
wp_enqueue_script('jquery-ui-core');
php wp_head(); 
?>

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