I am using [Image Click Selects Dropdown Item][1]. When using Chosen jQuery, onchange not fire. I am not familiar with js, thus would like to know code exactly on "$("form_field").addEvent('change', ... );".

HTML Code:
<select id="DropdownListID" name="DropdownListName" onchange="SelectAnItem(this.selectedIndex)">
    <option>Select here or click a pattern above.</option>
    <option>Fleur</option>
    <option>Nine Patch</option>
    <option>Pink Gate</option>
    <option>Sand Dollar</option>
    <option>Sandria</option>
    <option>Blue Wheel</option>
    </select>



Code javascript:
    // Place 2 --
    // Specify the leading characters of the id values assigned 
    //    to the images. The leading characters would be the id 
    //    value up to the image number.
 
    var LeadingImagesIdValue = "ImageID";
 
    //
    // End of customization.
    // // // // // // // // // //
 
    function SelectAnItem(ndx) {
    var d = document.getElementById(DropdownListIdValue);
    for( var i=0; i<d.length; i++ ) {
    d[i].selected = false;
    var imgi = i + 1;
    if( imgi < d.length ) {
        document.getElementById(LeadingImagesIdValue+imgi).style.borderColor = "#ffffff"; }
    }
    d[ndx].selected = true;
    if( ndx > 0 ) { 
    document.getElementById(LeadingImagesIdValue+ndx).style.borderColor = "#999999"; }
    }
 
    SelectAnItem( document.getElementById(DropdownListIdValue).selectedIndex );
    //--></script>


[1]: https://www.willmaster.com/library/m...pdown-item.php