function RetriveSites()
                    {
                    currentcontext = new SP.ClientContext(‘/collaboration/KeyWordsDemo’);
    /* to get the current context use this instead -à.get_current();*/
     /*more info http://msdn.microsoft.com/en-us/library/ee658863.aspx*/
                    currentweb = currentcontext.get_web();
                    this.subsites = currentweb.get_webs();
                    currentcontext.load(this.subsites);
                    currentcontext.executeQueryAsync(
                                    Function.createDelegate(this, this.ExecuteOnSuccess),
                                    Function.createDelegate(this, this.ExecuteOnFailure));
                    }

ExecuteOrDelayUntilScriptLoaded(RetriveSites,’sp.js’);

}

<select id=”teamsiteSelect” onchange=”navNow();”>
                <option value=”#”>Select Team Site…</option>
                <option value=”/collaboration/KeyWordsDemo”>Home</option>
</select>

function ExecuteOnSuccess(sender, args) {
                var subs =”;
                var Siteenum = this.subsites.getEnumerator();
                while (Siteenum.moveNext())
                                {
                                var Site = Siteenum.get_current();
                                $(‘#teamsiteSelect’).append( $(‘<option></option>’).val(Site.get_serverRelativeUrl).html(Site.get_title));
                                }

                }

function ExecuteOnFailure(sender, args) {
                //alert(“error”);
}