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dhtmlx calendar

I have included scripts dhtmlxcalendar.js and dhtmlxcommon.js and the following (<script>
                    mCal = new dhtmlxCalendarObject('dhtmlxCalendar', false, {isYearEditable: true});
                    mCal.loadUserLanguage('en-us');
                    mCal.draw();
</script>)
in my webpage . But when i try to run the page im getting a script error saying object required . Can some one help

The first line 
>>  mCal = new dhtmlxCalendarObject('dhtmlxCalendar', 
mean that you want to render calendar inside some object with ID='dhtmlxCalendar'
Please be sure that object with such ID exists and script called after such object rendered.