A pop reader of a browser searches HTML code for a webpage with a plurality of links for a first link specified with a first target file name comprising a pop type element. The pop reader, responsive to detecting the first link specified with the first target file name comprising the pop type element, inserts a first command into the HTML code to disable the first link and set an event to pop up a first menu layer of a plurality of layers of a cascading menu and inserts a second command to specify the content of the first menu layer from a file accessed for the first target file name. The browser, responsive to detecting the event, displays the first menu layer with the specified content by the second command within the interface displaying the webpage.