Attach to input

Source
<link rel="stylesheet" type="text/css" href="../../codebase/dhtmlxcalendar.css"></link>
    <link rel="stylesheet" type="text/css" href="../../codebase/skins/dhtmlxcalendar_dhx_skyblue.css"></link>
    <script src="../../codebase/dhtmlxcalendar.js"></script>
    <script>var myCalendar;
function doOnLoad() {
    myCalendar = new dhtmlXCalendarObject(["calendar", "calendar2", "calendar3"]);
}</script>
 
 
    <div style="position:relative;height:280px;">
        <input type="text" id="calendar">
        <input type="text" id="calendar2">
        <input type="text" id="calendar3">
    </div>