function option_display(data) {
    return OPTION({ 'value' : data[0] }, data[1] );
}    

function show_res(res) {
    var new_html = SELECT({'id': 'id_to', 
        'class' : 'vSelectField required"',
        'name' : 'to', 'size' : '1'}, map(option_display,res));

    swapDOM("id_to", new_html);
}

function get_search_results() {
    var id = this.id;
    var search_for = document.getElementById(id).value;
    if (search_for.length == 4) {
        var res = loadJSONDoc("/ajax/" + issue_slug + "/" + 
            search_for + '/');
        res.addCallback(show_res);
    }
}