 - Tom Gross, itconsense@gmail.com Author
 - Danny Bloemendaal, some portions of code taken from the 
   ATReferenceBrowserWidget implementation
 - Alexander Limi, limi@plone.org for improved UI 
 - Carsten Senger, senger@rehfisch.de, improve usability
 - Mathieu Le Marec - Pasquet, template fix
