My guess is that your previous attempt failed because the <script> tag that you used to include the calendar code in your document pointed to the wrong URL.  In order to include static files, such as javascript  (js), stylesheet, image files in your FoxWeb scripts, you must make sure that you store these static files in a web-accessible folder (as opposed to the folder where your fwx files reside) and use absolute URLs.  This topic is covered in depth in the Locating and Addressing Scripts topic of the FoxWeb documentation.