combobox visibility

i’m trying to swap out a select box with a combo box, everything works great, but i’m trying to figure out how to control the visibility.

i was using…

document.getElementById(‘CMedDose8’).style.display = ‘none’;

with CMedDose8 being the select box.

using javascript, how can i change the visibility of the combo box?

var combo = dhtmlXComboFromSelect(“CMedDose8”)“none”;