jVectorMap - Marker customization

HTML

<script src="http://jvectormap.com/js/jquery-jvectormap-1.2.2.min.js"></script>
<script src="http://jvectormap.com/js/jquery-jvectormap-world-mill-en.js"></script>
<link rel="stylesheet" href="http://jvectormap.com/css/jquery-jvectormap-1.2.2.css">
<div><select name="marker-select" id="marker-select"></select></div>
<div id="world-map-markers" style="width: 720px; height: 400px"></div>
<div id="site-details"></div>
<div id="popup"></div>

JavaScript

$(function () {
	//Array of marker objects. Other data can be added to the objects as long as they have "latLng" and "name"
     var markers = [{
         latLng: [41.90, 12.45],
         name: 'Vatican City'
     }, {
         latLng: [43.73, 7.41],
         name: 'Monaco'
     }, {
         latLng: [-0.52, 166.93],
         name: 'Nauru'
     }, {
         latLng: [-8.51, 179.21],
         name: 'Tuvalu'
     }, {
         latLng: [43.93, 12.46],
         name: 'San Marino'
     }, {
         latLng: [47.14, 9.52],
         name: 'Liechtenstein'
     }, {
         latLng: [7.11, 171.06],
         name: 'Marshall Islands'
     }, {
         latLng: [17.3, -62.73],
         name: 'Saint Kitts and Nevis'
     }, {
         latLng: [3.2, 73.22],
         name: 'Maldives'
     }, {
         latLng: [35.88, 14.5],
         name: 'Malta'
     }, {
         latLng: [12.05, -61.75],
         name: 'Grenada'
     }, {
         latLng: [13.16, -61.23],
         name: 'Saint Vincent and the Grenadines'
     }, {
         latLng: [13.16, -59.55],
         name: 'Barbados'
     }, {
         latLng: [17.11, -61.85],
         name: 'Antigua and Barbuda'
     }, {
         latLng: [-4.61, 55.45],
         name: 'Seychelles'
     }, {
         latLng: [7.35, 134.46],
         name: 'Palau'
     }, {
         latLng: [42.5, 1.51],
         name: 'Andorra'
     }, {
         latLng: [14.01, -60.98],
         name: 'Saint Lucia'
     }, {
         latLng: [6.91, 158.18],
         name: 'Federated States of Micronesia'
     }, {
         latLng: [1.3, 103.8],
         name: 'Singapore'
     }, {
         latLng: [1.46, 173.03],
         name: 'Kiribati'
     }, {
         latLng: [-21.13, -175.2],
         name: 'Tonga'
     }, {
         latLng: [15.3, -61.38],
         name: 'Dominica'
     }, {
         latLng: [-20.2, 57.5],
         name: 'Mauritius'
     }, {
         latLng: [26.02, 50.55],
         name: 'Bahrain'
     }, {
         latLng: [0.33, 6.73],
         name: 'São...