Issue in Image button of ASP.Net(Firefox)

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ASP.NET

<pre lang="vb">I would like to display a confirmation box using OnClientClick before calling a sub using onclick. The confirmation box is successfully displayed using OnClientClick but the sub is not called using onclick. How do I use OnClientClick and onclick together? Or is there a better way to do this? Thank you.

&lt;asp:imagebutton id=&quot;ImageButtonSubmit&quot; runat=&quot;server&quot; ImageURL=&quot;images/delete.jpg&quot; onclick=&quot;submit_button&quot; OnClientClick=&quot;return confirm(&#39;Are you sure you want to delete the messages?&#39;);&quot; &gt;&lt;/asp:imagebutton&gt;</pre>