[chaley]

You can do this with an icon rule, something like the following:

program:
	d1 = raw_field('#mydate');
	d2 = raw_field('pubdate');
	if and(field('#mybool_test') == 'yes',
		d1 != 'none',
		d2 != 'none') then
			if days_between(d1, d2) ># 0 then
				'yes.png'
			else
				'no.png'
			fi
	else
# Don't want an icon if the conditions aren't true. The else clause can be removed
		''
	fi