By A Web Design
Boxplus is a non-commercial plugin used in Joomla 1.5, Joomla 1.6 and Joomla 1.7 CMS. It is an ultimate lightweight pop-up window implementation (commonly known as a - lightbox) that can show images, video and other multimedia content including custom HTML content.
Some of the main features are:
And tons more . . .
Open a Browser window and enter http://extensions.joomla.org/ in its address bar and hit GO.
Enter the boxplus in the search textbox and click the search icon as shown in Diagram 1.

Diagram 1
On the search results page there will be a list of Joomla components and plugins displayed. Locate the link boxplus in the search results page and click on it as shown in Diagram 2.

Diagram 2
The Browser will navigate to a new page from where the boxplus plugin can be downloaded as shown in Diagram 3.
Click on DOWNLOAD to download the boxplus plugin as shown in Diagram 3.

Diagram 3
When you click on the DOWNLOAD button, a new tab will open which will display the Download Page http://joomlacode.org/gf/project/boxplus/frs/ shown in Diagram 4.
Click on boxplus { latest version } for Joomla 1.7 as shown in Diagram 4.

Diagram 4
Select Save File, and save the zip file to your hard disk. Click OK to save the zip file, as shown in Diagram 5.

Diagram 5
On click of OK, a file browser will open up. Navigate to an appropriate folder on your hard disk and save the plg_boxplus-{any_version}.tgz file on your local computer, - eg.: “X:\boxplus”. Here X:\ represents an appropriate drive letter on your computer as shown in Diagram 6.

Diagram 6
The archive file would be successfully downloaded and saved in the folder chosen as shown in Diagram 7.

Diagram 7
Now, the boxplus plugin is ready to be installed in your Joomla CMS.
For details on how to do that, please refer to - tutorial boxplus plugin for Joomla 1.7 Installation - on this website.