1. A graphical user interface comprising: a hypertext markup language (HTML) based web page for display on a computer display and comprising a graphical user interface (GUI) component, said GUI component comprising: a plurality of image files, each image file associated with a respective user selectable option from a plurality of selectable options; and a JavaScript routine for responding to user input and based thereon for selecting an image file of said plurality of image files, said selected image file being displayed within said HTML based web page.