Auto Thickbox Plus

It shows single images and photo albums inside an overlayed modal window.

The plugin is based on the  Auto Thickbox v.2.0.3 jQuery script.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

Features:

• Automatically applies ThickBox script to thumbnail images
• Write image links to images (img tag enclosed with link tag), and this plugin overlays (pops up) linked images.
• Pop-up effects are simple and fast compared to Lightbox and derivative scripts (no animation effects, no fancy design)
• Uses WordPress' built-in ThickBox library (no need to install the script and refer to it separately)
• Overlays (pops up) images in not "Gallery Images" but "Single Image" style
• Automatically also applies ThickBox to text links to images (text enclosed with link tag)
• Loads additional CSS file (ex. rounded corners in pop-up windows)
• Has Auto Thickbox Plus Options in 'Settings' menu (You can change the behavior of the above items)
• Supports BMP and WebP image formats

What is new in this release:

• Mobile beta support for small-screen devices such as iPhone, Android, Symbian, BlackBerry and Windows Phone. This is experimental support so it may not work on some version of mobile browsers.
• Enhanced Auto Resize feature so that it works even when resizing browser window, even when showing iframe/ajax/inline content. Then, changed "Enabled" option to "Image/HTML" option at "General - Auto Resize" setting.
• "General - Mobile Support (beta)" setting that has "No Window Margin / No ThickBox" option and "Width/Height" option
• "View - Margin - Window (Image/HTML)" option

What is new in version 1.7:

• FIXED:
• PDF cannot be opened in IE and Firefox because "onload" event won't be triggered (ThickBox bug)
• Removes whitespaces from both ends of gallery caption (regression in v1.5)
• Improved Right-to-Left (RTL) support in Options page when using Persian and so on
• Workaround for the issue that Media Uploader does not work in WordPress 3.3.3 or later
• 'First'/'Last' are not translated in ThickBox window because WordPress translations are split into locale.pot and locale-admin.pot since WordPress 3.4. So 'First'/'Last' had translated only in Options page.
• UPDATED:
• French translation.
• ADDED:
• Persian/Farsi (fa_IR) and Spanish translation.

What is new in version 1.6:

• Added "General - Auto ThickBox" option.
• Improved Media Uploader.
• Added About metabox to options page.

What is new in version 1.5:

• Add "Effect - Title/Caption - Hide initially" option.
• Support a gallery that contains images with same URL. ThickBox had regarded images with same URL as one image. Now ThickBox checks images with an object instead of its URL.
• ThickBox accepts width/height/modal parameters in not only iframe/ajax content but also image content.
• Fix: anchor-utils filter does not detect an empty anchor tag (e.g. <a name="test"><a>), props Olivier Burgard. If an empty anchor tag is in front of image link, "thickbox" class cannot be added to the link then the image cannot be overlaid by click. [original bug]
• Fix: Transparent checkboxes cannot be unchecked when using Color Picker (regression in v1.1)
• Update Dutch translations (props Michel Bats) and Japanese translations

What is new in version 1.4:

• ThickBox window size is completely wrong when showing images in WordPress 3.2.1 or earlier
• The width of title bar is smaller than inline/AJAX content in WordPress 3.0.6 or earlier
• Close/Loading image paths are incorrect when using built-in ThickBox in WordPress 3.1.4 or earlier
• Click event handlers are triggered by drag-moving images in WordPress 2.9.2 or earlier
• In options page, options using JavaScript/CSS are not effective in WordPress 3.2.1 or earlier (e.g. PostBox, Color Picker, Color Preview, UI Slider, Media Uploader, etc.)
• In options page, most content is not output in WordPress 2.9.2 or earlier

What is new in version 1.3:

• Add "Action - Mouse Click - Clickable Range" option

What is new in version 1.2:

• Compatibility with cache plugins is enabled only when WP_DEBUG is true.
• Replace white blank.gif with transparent blank.gif.
• Not output <script> tag when original thickbox.js is enabled.
• Update Japanese translations.

What is new in version 1.1:

• Place jQuery UI Slider at Opacity option
• Place WordPress Media Uploader at Image options
• Add Transparent checkbox to Background Color options, and None checkbox to Border, Box/Text Shadow options

What is new in version 1.0:

• Improved Options page UI.

Requirements:

• WordPress 2.8 or higher