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Thanks John and xgarb, I am still on an Everest of a learning curve so here goes. John, I found .htaccess in the root menu and managed to read it but there did not seem to be any untoward entries, some 10 in total [but then I am not sure what to look for]. I also went into the script for mainfile.php to see if there might be a nasty hidden in there, I can copy the bit that I was curious about to you, but I don't want to put it on here.
xgarb, a bit of grade 4 stuff here, htdocs is what or where? I am happy to put that chmod command in there - makes sense to me - just got to find it !! Thank you for your time and excuse my stupidity. Charlie.