Sets which additional sources of potential JavaScript links to
check. Some JavaScript links may not be found when scripts on a
walked page are executed, so the internal list of all JavaScript
string objects is scanned for potential URLs according to the checked
boxes. Menu will look for common JavaScript menu navigation
system links; Protocol will look for strings that look like
valid fully-qualified Web links; File will look for probable
file strings.
Note that any of these sources may potentially find incorrect links,
especially the File type. Checking File is generally used
only as a last-ditch effort to find some JavaScript links.