This script scans a web page and dynamically modifies keywords an advertiser has targeted on the page and double-underlines them. This process works by allowing webmasters to insert JavaScript code into web pages that displays relevant advertisements from an inventory of advertisers. Sometimes the words may appear in various colors such as blue or green with only a single underline. When hovering your mouse over this keyword, a pop up ad is displayed with a preview of the ad the text links to. The keyword is intended to provide consumers with information that is related to what they are reading. The double-underlined word is actually a keyword embedded within text of a web page. Kontera and Vibrant are two of the more popular advertising networks that provide in-text advertising and information services. The use of in-text advertising is very common. This is mostly informational for those reading this topic: