Today, by using the mind-boggling powers of the World-Wide-Web, HTML and JavaScript, RBO is proud to present:
Enter any Arabic number between 1 and 9999 in the text box below, then click on the 'Translate...' button. The corresponding Roman numeral will appear in the space below the text box.
Please note that this JavaScript routine is presented on the understanding that you can do whatever the hell you want with it. I will be updating the program to do retro-translations - that is, Roman to Arabic - in the very near future. Also on the agenda is an amendment to cope with a higher input value. 
The main works consulted during the construction of this page were; The HTML Programmer's Reference by T.A. Powell and D. Whitworth, Pure JavaScript by Wyke, Gilliam & Ting, The Collins Gem Latin Dictionary, and The Romans - An Introduction by Antony Kamm. Large amounts of coffee were also imbibed. 
