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The Jquery dialog which is part of the ui set of widgets is great for adding pop up functionality to your pages. However the plugin will move the element that is being turned into a dialog to the bottom of the DOM. This can be problematic if you are displaying part of a form in a dialog because the form element will be popped out of its form element and not be posted.
The only solution to this was to move the elements back manually when the dialog closes. You can do this with the following.
If you need a London based Drupal developer you can hire me. Check the availability page and contact me on info@aprium.net.