These are various banners that are provided for usage in a webMathematica site. Certain webMathematica licenses require that one of these banners is displayed on active pages with a hyperlink to http://www.wolfram.com/webmathematica/sitelink. This can be done with the following HTML fragment.
The image files are all found in the webMathematica web application and in the MSP Mathematica application.
These are various buttons that are available for usage by a webMathematica site.