// Get xml data & append to selectbox
    $.ajax({
        type: "GET",
        url: "test.xml",
        dataType: "xml",
        success: function(xml){
        $(xml).find('ReportOptions').each(function() {
            var cNum = $(this).find('cusipnum').text();         // assign vars to incoming data
            $('#cusip').append('<option>'+cNum+'</option>');    // append data to options
        });
            $('#cusip').multiselect('refresh');
    },
        error: function (xhr, ajaxOptions, thrownError) {
            alert("Error Status:"+xhr.status+", "+thrownError);
         }
    });