* The options will be disabled when the corresponding 'None' checkbox is checked (JavaScript)
* Copy tb-close.png, loadingAnimation.gif etc from wp-includes/js/thickbox/ directory
* Fix: Loading image is not displayed in the exact center of browser window (thickbox.css bug)
* Add the following 'Mouse Click' actions/options
* Image: Next, Prev / Next (click on the left/right side of image)
* Image (First / Last): Close, None, Loop (Last / First)
* will be disabled when [Image - Close or None] item are selected (JavaScript)
* Create prev/next/first/last icons
* these icons & close icon are displayed on the left/right side of image when hovering image
* Append first/last string to thickboxL10n object at wp_localize_script() call