The script for the "hypertext" button includes the following command:
put " in field" & quote & "Title" & quote after message
This is used to restrict the hypertext search to the field "Title".
If you wish to create and search in other fields, simply replace the word "Title" with the name of the field.
The "if" commands allow different fields to be searched in a heirarchy of your construction, and can be modified and repeated with nesting for the number of fields you desire. They may also be removed if the title search is all you desire.