#file=geisa_post_nbcl
#on entry: $menu_opt=...Nbcl=n&... (POST method)
#      or: $menu_opt=...Nbclu=u&...Nbcld=d... (POST method)
#on exit: defines $nbcl=",nbclass=[n|10*d+u]" if [n|10*d+u] != $nbcld
#                 $nbcl="" otherwise.
#                 $execute_parms=$execute_parms$nbcl
nbcld=10
ifs=$IFS;IFS="&";nbcl=;m=;for s in $menu_opt;do
l=`expr "$s" : 'Nbcl=\(.*\)'`
[ "$l" ]&&{ [ "$l" != "$nbcld" ]&&nbcl=",nbclas=$l";break;}
l=`expr "$s" : 'Nbcld=\(.*\)'`
[ "$l" ]&&{ m=$l; continue;}
[ "$m" ]||continue
l=`expr "$s" : 'Nbclu=\(.*\)'`
[ "$l" ]&&{ l=`expr 10 \* $m + $l`;[ "$l" != "$nbcld" ]&&nbcl=",nbclas=$l";break;}
done;IFS=$ifs
execute_parms=$execute_parms$nbcl