images in dhtmlx combo

If one want to use images in front of the combo items what are the requirements for the images (especially size) to be used?

There are two combo special types “image” and “checkbox”. The type is set in the 4th parameter of the dhtmlXCombo constructor.

var combo = new dhtmlXCombo(“combo_container”,“alfa”,200, ‘image’);

To set “image” type you need to include the dhtmlxcombo_extra.js. And image size is 18x18

The sample is dhtmlxCombo/samples/03_options/03_combo_options.html

Thank you Alexandra