button onclick event not firing...when onclientclick returns true

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ASP.NET

Javascript

jQuery

hello everyone, i have a button in asp.net as follows

<asp:Button ID="btnNext" runat="server" Height="26px" OnClientClick="return CheckIfOptionSelected();" OnClick="btnNext_Click" Text="Next"
                Width="77px" />

i have done some validation to radio buttons, if nothing is selected in the radio buttons then it returns false...hence the server side event does not fire. This works fine, however, i have a jquery timer...and according to the requirement...after the timer elapse i want to submit the form...or cause the onclick to fire no matter what...so i've written the following

function CheckIfOptionSelected() {

            var radioButton1 = document.forms[0].elements['ctl00_MainContent_rdBtnListOptions_0'];
            var radioButton2 = document.forms[0].elements['ctl00_MainContent_rdBtnListOptions_1'];
            var radioButton3 = document.forms[0].elements['ctl00_MainContent_rdBtnListOptions_2'];
            var radioButton4 = document.forms[0].elements['ctl00_MainContent_rdBtnListOptions_3'];
           
            if (radioButton1.checked != true && radioButton2.checked != true && radioButton3.checked != true && radioButton4.checked != true && countdownCurrent != 0) {

                return false;
                
            }

            else {
                countdownReset();
                return true;
            } 
        }

        function countdownReset() {
            var newCount = parseInt($('#ctl00_MainContent_example2submit').val()) * 100;
            if (newCount > 0) { countdownCurrent = newCount; }
        }

now this works fine as well...but only when nothing is selected in the radiobuttonlist...however ,if i select an item...and let the timer elapse...in this case the onclick does not fire. I don't know what the issue is?...FYI- the jquery causes the "Next" button to Click itself when the timer elapse.

the jquery i'm using...

var countdownTimer, countdownCurrent;
        $(document).ready(function () {
            countdownCurrent = $('#ctl00_MainContent_example2submit').val() * 100;
            countdownTimer = $.timer(function () {
                var min = parseInt(countdownCurrent / 6000);
                var sec = parseInt(countdownCurrent / 100) - (min * 60);
                var micro = pad(countdownCurrent - (sec * 100) - (min * 6000), 2);
                var output = "00"; if (min > 0) { output = pad(min, 2); }
                $('.countdowntime').html(output + ":" + pad(sec, 2) + ":" + micro);
                if (countdownCurrent == 0) {
                    var btn = document.getElementById('<%=btnNext.ClientID%>');
                    btn.click();

                } else {
                    countdownCurrent -= 7;
                    if (countdownCurrent < 0) { countdownCurrent = 0; }
                }
            }, 70, true);
            $('#example2submit').bind('keyup', function (e) { if (e.keyCode == 13) { countdownReset(); } });

        });

another thing i noticed is that the generated HTML contains onclick="return CheckIfOptionSelected();"...

<div class="ctrlStyle1">
            <span id="ctl00_MainContent_btnNext$ajaxdest" name="__ajaxmark"><input type="submit" name="ctl00$MainContent$btnNext" value="Next" onclick="return CheckIfOptionSelected();" id="ctl00_MainContent_btnNext" style="height:26px;width:77px;" /></span>   
            <span id="ctl00_MainContent_btnSubmit$ajaxdest" name="__ajaxmark"></span>
        </div>