I propose you this solution with Bootstrap Datepicker

<!--Html part-->
    <div class="input-append date" id="datepicker" data-date="" data-date-format="mm-yyyy"> 
        <input  type="text" readonly="readonly" name="date" >     
        <span class="add-on"><i class="icon-th"></i></span>   
    </div>

<!--Js part-->
<script type="text/javascript">
    $("#datepicker").datepicker( {
    format: "mm-yyyy",
    viewMode: "months", 
    minViewMode: "months"
    });
</script>

More informations in : Bootstrap datepicker doc

Nb: don't forget to include this if you don't have theme:

• bootstrap-combined.min.css

• datepicker.css

• bootstrap.min.js

• bootstrap-datepicker.js

I propose you this solution with Bootstrap Datepicker, Demo: JsFiddle

<!--Html part-->
    <div class="input-append date" id="datepicker" data-date="" data-date-format="mm-yyyy"> 
        <input  type="text" readonly="readonly" name="date" >     
        <span class="add-on"><i class="icon-th"></i></span>   
    </div>

<!--Js part-->
<script type="text/javascript">
    $("#datepicker").datepicker( {
    format: "mm-yyyy",
    viewMode: "months", 
    minViewMode: "months"
    });
</script>

More informations in : Bootstrap datepicker doc

Nb: don't forget to include this if you don't have theme:

• bootstrap-combined.min.css

• datepicker.css

• bootstrap.min.js

• bootstrap-datepicker.js