#file=geisa_post_histo
#on entry: $menu_opt=...Histo=hhh&... (POST method)
#on exit: defines $histo=",histo='hhh'"
#                 $execute_parms=$execute_parms$histo
ifs=$IFS;IFS="&";histo=;for s in $menu_opt;do
l=`expr "$s" : 'Histo=\(.*\)'`;[ "$l" ]&&{ histo=",histo='$l'";break;}
done;IFS=$ifs
[ "$histo" ]||
{
echo "<em>"
 echol "Erreur: Aucun histogramme s&eacute;lectionn&eacute;" "Error: No selected histogram"
 echo "!</em><br>"
error=1
}
execute_parms=$execute_parms$histo