function check(field)
{
	for (i = 0; i < field.length; i++)
	{
		field[i].checked = true;
	}
}
function uncheck(field)
{
	for (i = 0; i < field.length; i++)
	{
		field[i].checked = false;
	}
}

function checkChoice(field, i) {
if (i == 0) { // "All" checkbox selected.
if (field[0].checked == true) {
for (i = 1; i < field.length; i++)
field[i].checked = false;
   }
}
else  {  // A checkbox other than "Any" selected.
if (field[i].checked == true) {
field[0].checked = false;
      }
   }
}