A plug-in is provided to existing electronic message programs, such as electronic mail message programs, to provide a virtual toolbar therein. The virtual toolbar includes one or more virtual buttons that allow a user to select multimedia content to be added to an electronic message. The multimedia content may include, without limitation, any one or more of: graphics, audio, animation, video and text selections. The multimedia content may further include customizable templates in which business messages may be generated. The virtual buttons may be each be assigned to one category of related content, such as Backgrounds for providing graphic backgrounds to a message, Holiday Themes for providing multimedia content associated with particular holidays, Animations for including FLASH animations or the like to a message, and Text for including pre-formatted text to a message. The content, appearance and number of virtual buttons may automatically be changed or updated by a content provider from time to time when the installed plug-in accesses a content server over a computer network, such as the Internet.