@Chris
I decided to simply delete everything and reinstall. Not straightforward for me. I had the archive in my NetSurf drawer and chose to unarch there. It said it wouldn't make a new drawer, but after a failure (something about something already being there) I checked and there was a NetSurf/NetSurf/.
Started over, moving the archive to RAM: where I unarchived it and ran Install. In the installation process I was asked whether to add it to launch-handler, suggesting "no" if it had been done before. I looked at launch-handler, and couldn't find any indication of what might be there, so guessed that I had probably answered "yes" the first time I installed NetSurf, and went "no."
Given the chance, I chose to install the Cairo version.
Later I was told that install had failed to copy libz.so.1.2.5 but it would be updated the next time I booted or something.
After deleting the old NetSurf, I copied RAM:NetSurf and RAM:NetSurf.info to that location.
About this time something crashed the machine and I had to use the reset button.
I clicked the NetSurf icon and a window opened, containing Install, NetSurf.guide, netsurf.readme, and Rexx. "Show all files" got me a lot more, including screwdriver icons labelled "ftr," "NetSurf-Cairo," and "NetSurf." C:list reports
Directory "Space:Internet/NetSurf" on Tuesday 09-Nov-10
ChangeLog 16201 ----rw-d 23-Sep-10 18:59:20
COPYING 20308 ----rw-d 23-Sep-10 18:59:20
fitr 69385 ----rwed 23-Sep-10 18:59:20
Install 12498 ----rwed 23-Sep-10 18:59:20
Install.info 8892 ----rw-d 23-Sep-10 19:00:02
NetSurf 8579367 ----rwed 23-Sep-10 18:59:20
NetSurf-Cairo 1556237 ----rwed 23-Sep-10 18:59:20
NetSurf.guide 11032 ----rwed 23-Sep-10 18:59:20
NetSurf.guide.info 6741 ----rw-d 23-Sep-10 19:00:02
netsurf.readme 697 ----rwed 23-Sep-10 18:59:20
netsurf.readme.info 6238 ----rw-d 23-Sep-10 19:00:02
Resources Dir ----rwed Today 16:49:37
Rexx.info 6206 ----rw-d 23-Sep-10 19:00:02
Rexx Dir ----rwed Today 16:09:37
SObjs Dir ----rwed Today 16:09:37
I clicked the NetSurf screwdriver, then Execute, and determined that my initial problem--not getting jpegs properly loaded, was solved. Clicking "fitr" and "Execute" just gets me
"fitr (c) 2009 Chris Young
http://www.unsatisfactorysoftware.co.uk/fitr." I'm not sure what that's for.
Clicking the NetSurf-Cairo screwdriver, representing my install choice, and Execute gets me the "Failed to load shared object libz.so" sequence that bothered me before and "NetSurf-Cairo: file is not executable." OK, I guess, as long as the "NetSurf" screwdriver works.
I was a bit surprised to find NetSurf/SObjs. Sys:SObjs contains the same files--do I need both?