Advertisements displayed in a web page are enabled to be changed as a context of the web page changes without reloading the web page. A first set of one or more advertisements may be displayed on a web page. One or more of the displayed advertisements may be replaced with one or more alternative advertisements. Selection of the alternative advertisements is triggered based on the occurrence of one or more events that cause a change in a context of the web page. The display of the alternative advertisements is performed dynamically, without the web page needing to be reloaded. In this manner, the advertisements displayed on a web page may be changed based on the change in web page context, to provide advertisements to users that correspond to the changing context.