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How to enable checkbox and images on combobox?

Hi,


How can we enable checkboxes AND images on a combobox?

here I can only set opt_type for 'image' or 'checkbox'...

<select style='width:220px;' id="zone1" name="alfa1" opt_type="image" >
        <option value="0"></option>
<option value="1" img_src="dhtmlx/book.gif" >a00</option>
<option value="2" img_src="dhtmlx/ico_xls_18.gif">a01</option>
<option value="3">a02</option>
<option value="4">a10</option>
<option value="5">a11</option>
</select>


<script type="text/javascript">
    var z=dhtmlXComboFromSelect("zone1",100);
    z.enableFilteringMode(true);
    z.setOptionHeight('18px');
    zattachEvent('onChange', set);
</script>

thank you

The option may have checkbox OR image , it can't use both. Also it not possible to mix different type of options in same combo ( all options must have the same type )

>>But its possible to include some more javascript code to enable this geature right?
Each type of option is a separate object, so in theory it possible to create any kind of option, by creating new type of such object, but it will require significent amout of coding. 

>>: How do I atach a function to the checkboxes to be called on checkbox change?
There is no special event for such operation, but combo has a method combo.getChecked() which returns list of currently checked items.

>>also sending arguments to the z.attachEvent('onChange', set_it(var) ); doesnt work
The second argument of onChange must be a function object
              z.attachEvent('onChange', set_it);
If you need to provide some additional param it can be done as
     var param="some";
     z.attachEvent("onChange",function(){
                 set_it(param);
     });