Mine

function test_why(box_id, dropdown){//var info = document.getElementById(dropdown).valuevar info = document.getElementById(dropdown);var info1 = info[info.selectedIndex].valueif(info1 == 0){var box = 'why_box_' + box_idvar drop = 'why_drop_' + box_iddocument.getElementById(drop).display = 'none'document.getElementById(box).display = 'block'}}	<select name='why_dropdown_1' onchange='test_why(1, "why_dropdown_1")'>	<option value='1'>DT. HBO mål</option>	<option value='2'>DT. tider</option>	<option value='3'>Vundet konkurrence</option>	<option value='4'>Kasse tider</option>	<option value='5'>Nået mål</option>	<option value='0'>Skriv selv grund</option>	</select>