1. Not a scripting question, is it?
2. Neither of these fonts "come" with InDesign, so they should be installed in your system. Are they available in any other program?
(Moved to the InDesign general forum.)
I can't find any reference to a handwriting font named Bradshaw anywhere. Are you sure you have the name right? ITC Bradley Hand Regular, along with Papyrus and the Lucida (no "n") family are all included with recent versions of Windows, though, and should be in your font list in CS5 if you are, in fact, running Windows.
Is this the same machine that has CS3 installed? Did you remove CS3? Do the fonts show up in any other programs? Indesign can see fonts that are installed in the system fonts, the Common Files > Adobe > Fonts folder, and the private fonts folder for InDesign in the application folder. If the fonts show in CS3, but not elsewhere, they are probably in the CS3 InDesign Fonts folder.