The JavaScript below contains the template that must be used when setting up the tracking script.

<script type="text/javascript">
    var _ctq = _ctq || [];
    _ctq.push(['setSiteId', Site ID]);
    _ctq.push(['requires', [Group 1, Group 2, ..]]);
    // Insert calls to replacement methods here

    (function() {
        var wca = document.createElement('script'); wca.type = 'text/javascript'; wca.async = !0;
        wca.src = "//";
        var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(wca, s);

Calls to replacement methods (described in the Methods section) must be inserted into this tracking script to enable number switching.