jQuery Dialog box is not working

I use dialog box when inserting a note. The dialog box is working on the local but when i upload to the live site it is not working anymore.

The JS library is there.

There is an error message "jQuery("#dialog-form").dialog is not a function"

<div id="dialog-form" title="Add Note" sty开发者_运维技巧le="text-align: left; display:none;">

Thanks, Justin

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You should include jquery-ui.js to your page before you can use this function and be aware that the modal dialog should be included in your jquery-ui file