EraIcons is a JavaScript user script that enables users to add era icons to the headers of pages in both the Oasis and Monobook skins. Icons are stored in a file (example here) and appended by the script to the header of the page. The script will use whatever styles are included in the wiki's Common.css, Wikia.css, or Monobook.css files to display the icon properly, though users may elect to use the script's default stylesheet through the inclusion of a window variable, namely window.useIncludedStylesheet = true;