I haven't checked these for many years. I'll try to take a look at it over the weekend, probably some issue with Javascript and modern browsers as the
TDR page was written over 20 years ago and I modified it back in 2008 to work with browsers at that time.
EDIT: found the issue, the javascript used a variable name "status" to hold a numeric value of the options selected and then bitwise compare it to constant numbers, but the "status" variable is forced to be a string by modern browsers (it used to work 18 years ago!) so causes the issue. I've renamed the variable to stat and that appears to have fixed it.