Jquery datepicker throwing too much recursion error

Question

Im trying to modify the jquery datepicker with done button as clear button. but it is throwing too much recursion error... my code is,

function datePickerToCompareTwoFields(){
    var dformat = document.getElementById('dateFormat').value;
    $( '#popup_container, #popup_container1' ).datepicker({
        beforeShow: customRange,
        changeMonth: true,
        changeYear: true,
        closeText: 'Clear',
        dateFormat: dformat,
        numberOfMonths: 2,
        selectOtherMonths: true,
        showButtonPanel: true,
        showOtherMonths: true
    });
    $.datepicker._generateHTML_Old = $.datepicker._generateHTML;
    $.datepicker._generateHTML = function(inst) {
        res = this._generateHTML_Old(inst); 
        res = res.replace("_hideDatepicker()","_clearDate('#"+inst.id+"')");
        return res;
    }
}