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Problems with images in combobox

Im trying to init combobox with image icons:

var z=new dhtmlXCombo("combo_zone2","alfa2",200,'image');
z.setDefaultImage("images/user_icon.gif");

.....

It wont work at all and always gives error like "z.setDefaultImage is not a function".
Could you please help?

Please, check that dhtmlxcombo_extra.js is included.