The onclick event is not not working

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ASP.NET

Javascript

I have the code Like

<script type="text/javascript">
        function saveCoOrdinate() {
            var offsetPanel = $("[id$=imgCertificate]").offset();
            var len = $(".dragMe").length;
            for (var i = 1; i <= len; i++) {
                var cont = $('.dragMe span:contains("' + i + '")').text();
                var offsetText = $('.dragMe:contains("' + cont + '") textarea').offset();
                var offsetTop = offsetText.top - offsetPanel.top;
                var offsetLeft = offsetText.left - offsetPanel.left;
                $("[id$=ddlBoxName]").append($("<option>" + cont + "</option>"));
                $("[id$=ddlXCoOrdinates]").append($("<option>" + offsetTop + "</option>"));
                $("[id$=ddlYCoOrdinates]").append($("<option>" + offsetLeft + "</option>"));
            }
            //document.getElementById("[id$=btnSaveValues]").click();
        }
    </script>

and drop down list

<asp:DropDownList ID="ddlBoxName" runat="server">
                </asp:DropDownList>
                <asp:DropDownList ID="ddlXCoOrdinates" runat="server">
                </asp:DropDownList>
                <asp:DropDownList ID="ddlYCoOrdinates" runat="server">
                </asp:DropDownList>

and the button

<asp:Button ID="btnSaveValues" runat="server" Text="Save" OnClientClick="saveCoOrdinate(); return false;"
UseSubmitBehavior="false" OnClick="btnSaveValues_Click" />
the onclick event is not working