i have one jquery code

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Javascript

<script type="text/javascript">

    $(document).ready(function () {
        $("#txt_fromdate").datepicker({
            showOn: "button",
            buttonImage: "../Images/cal.png",
            buttonImageOnly: true,
            closeText: "Close",
            changeMonth: true,
            changeYear: true,
            dateFormat: 'dd/mm/yy',
            maxDate: '30/12/2014',
            yearRange: '1950:2014'
        });
    });

    $(document).ready(function () {
        $("#txt_todate").datepicker({
            showOn: "button",
            buttonImage: "../Images/cal.png",
            buttonImageOnly: true,
            closeText: "Close",
            changeMonth: true,
            changeYear: true,
            dateFormat: 'dd/mm/yy',
            maxDate: '30/12/2014',
            yearRange: '1950:2014'
        });
    });

</script>

when i click on image then calender display but i want that instead of image calender should be
open when i click on textbox ,, how can i do this by this code
plz help me