How to write Jquery validation for Radiobutton in asp.net?

Question

Hi,

        I have taken two radio buttons in my asp.net webform like below,

<asp:RadioButton ID="rbmale" runat="server" Text="Male" GroupName="rb" style= "height:120px ; width:120px"/>
<br />

<asp:RadioButton ID="rbfemale" runat="server" Text="FeMale" GroupName="rb" style= "height:120px ; width:120px" /> 

in my script i wrote this,

         <script type="text/ javascript" language="javascript"

  var rbmale = $('[id*="rbmale"]').val();
var rbfemale = $('[id*="rbfemale"]').val(); 

if()

{

//what should I write in this?

}

<script/>

           Please help me in this code..