javascript - Asp.net button event handler not working with validation? -

i can't seem know wouldn't work.
have button js call open form in fancybox modal fine.

i can validate data in form fine using asp.validation , throw messages in group div if required.
when try submit form, doesn't anything.

        <asp:textbox id="miemailtextbox" runat="server" text="email address" cssclass="miemailfieldtextbox"></asp:textbox><asp:button id="miemailfieldsubmitbutton" runat="server" text="submit" cssclass="buttonpositive" onclientclick="return nextclick()" /> 

js open fancybox opens contents of div.

function nextclick() {     var emailaddress = $("[id$='_miemailtextbox']").val();     if (emailaddress != "email address" && emailaddress != "") {         $("[id$='email']").val(emailaddress);         $.fancybox({             'width': 480,             'height': 360,             'autoscale': false,             'modal': false,             'autodimensions': false,             'centeronscroll': true,             'title': 'enews signup',             'titleposition': 'over',             'href': '#popupdiv',             'oncomplete': function () {                 $("#fancybox-inner").css({ 'top': '50px', 'bottom': 'auto', 'height': '320px' });             }         });         return false;     } } 

open div in modal validation

<div style="display: none;"> <div id="popupdiv">     <div id="popupmessagediv" runat="server">         <asp:hiddenfield id="cinemaidhiddenfield" runat="server" />         <asp:literal id="failuretext" runat="server" enableviewstate="false"></asp:literal>         <asp:validationsummary id="validationsummary1" cssclass="validationsummary" validationgroup="createuserwizard1"             runat="server" headertext="<span>sorry, there problems information:</span>" />         <div id="confirmdetailsdiv" runat="server" visible="false" class="validationsummary positive">             <span>almost done! </span>             <p>                 please review details below before submitting payment.<br />             </p>         </div>         <div class="form-row form-required">             <asp:label id="emaillabel" runat="server" associatedcontrolid="email">e-mail:</asp:label>             <asp:textbox id="email" runat="server" cssclass="modalfieldtextbox" tooltip="please enter <strong>e-mail address</strong>."                 maxlength="98"></asp:textbox>             <asp:customvalidator id="emailcustomvalidator" runat="server" errormessage="sorry, <strong>email address</strong> registered."                 controltovalidate="email" display="none" validationgroup="createuserwizard1"></asp:customvalidator>             <asp:regularexpressionvalidator id="emailregularexpressionvalidator" runat="server"                 controltovalidate="email" display="none" errormessage="your <strong>email address</strong> not appear correct. "                 validationexpression="(\w[-._\w]*@\w[-._\w]*\w\.\w{2,3})" enableclientscript="true"                 validationgroup="createuserwizard1"></asp:regularexpressionvalidator>             <asp:requiredfieldvalidator id="emailrequiredfieldvalidator" runat="server" controltovalidate="email"                 errormessage="you must enter <strong>email address</strong>." enableclientscript="true"                 validationgroup="createuserwizard1" display="none" setfocusonerror="false"></asp:requiredfieldvalidator>              <asp:customvalidator id="customvalidator1" runat="server" display="none" enableclientscript="false"                 errormessage="customvalidator" validationgroup="createuserwizard1"></asp:customvalidator>         </div>         <br />         <div class="form-row form-required">             <asp:label id="emailconfirmlabel" runat="server" associatedcontrolid="emailconfirm">                 confirm e-mail:             </asp:label>             <asp:textbox id="emailconfirm" runat="server" cssclass="modalfieldtextbox" tooltip="please enter <strong>e-mail address</strong>."                 maxlength="98"></asp:textbox>             <asp:comparevalidator id="emailcomparevalidator" runat="server" enableclientscript="true"                 controltocompare="email" controltovalidate="emailconfirm" display="none"                 validationgroup="createuserwizard1" errormessage="your email address not match!"></asp:comparevalidator>         </div>         <br />         <div class="form-row form-required">             <asp:label id="postcodelabel" runat="server" associatedcontrolid="postcode">                 post code:</asp:label>             <asp:textbox id="postcode" runat="server" cssclass="modalfieldtextbox" maxlength="4"></asp:textbox>             <ajaxtoolkit:filteredtextboxextender id="postcode_filteredtextboxextender" runat="server"                 enabled="true" filtertype="numbers" targetcontrolid="postcode">             </ajaxtoolkit:filteredtextboxextender>             <asp:regularexpressionvalidator id="re6" controltovalidate="postcode" runat="server"                 validationgroup="createuserwizard1" validationexpression="^.{2,}$" errormessage="a postcode must have @ least 2 characters."                 tooltip="a postcode must have @ least 2 characters." display="none" enableclientscript="false"></asp:regularexpressionvalidator>             <asp:regularexpressionvalidator id="postcoderegularexpressionvalidator" runat="server"                 controltovalidate="postcode" display="none" errormessage="sorry, post code must contain numbers."                 validationexpression="^[^<^>]*$" validationgroup="createuserwizard1" setfocusonerror="true"                 enableclientscript="false"></asp:regularexpressionvalidator>             <asp:requiredfieldvalidator id="postcoderequiredfieldvalidator" runat="server" errormessage="please enter <strong>post code</strong>."                 controltovalidate="postcode" display="none" validationgroup="createuserwizard1"></asp:requiredfieldvalidator>             <asp:customvalidator id="postcodecustomvalidator1" runat="server" controltovalidate="postcode"                 display="none" validationgroup="createuserwizard1" enableclientscript="false"></asp:customvalidator>         </div>         <br />          <div class="form-row form-required">             <span> </span>                         <asp:button id="createsubcriberbutton" runat="server" text="create subscriber" cssclass="buttonpositive"             validationgroup="createuserwizard1" causesvalidation="true" onclick="createsubcriberbutton_click" onclientclick="return true;"/>          </div>     </div> </div> 

but when click on createsubcriberbutton doesn't anything. should handled code behide

protected void createsubcriberbutton_click(object sender, eventargs e) {     response.redirect("http://google.com.au"); } 

i've inspect element , returns

<input type="submit" name="ctl00$belowheadercontentplaceholder$ctl00$createsubcriberbutton" value="create subscriber" onclick="return true;webform_dopostbackwithoptions(new webform_postbackoptions(&quot;ctl00$belowheadercontentplaceholder$ctl00$createsubcriberbutton&quot;, &quot;&quot;, true, &quot;createuserwizard1&quot;, &quot;&quot;, false, false))" id="ctl00_belowheadercontentplaceholder_ctl00_createsubcriberbutton" class="buttonpositive"> 

i tried remove asp:validation controls , normal form submit no luck.
modal?
i've been using asp:button event handler method , worked till when tried adding form in modal.
appreciated.