function checkChoice(field, i) {
if (i == 00) { // "All" checkbox selected.
if (field[00].checked == true) {
for (i = 01; i < field.length; i++)
field[i].checked = false;
   }
}
else  {  // A checkbox other than "Any" selected.
if (field[i].checked == true) {
field[00].checked = false;
      }
   }
}