It looks to me like your theme is broken as your site correctly loads jQuery 1.8.3 as shipped with WordPress, and then later loads another instance of jQuery, this time version 1.4.2 from the Google CDN.
<!-- DIALOG POP UP SCRIPTING START -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function() {The fact it is being loaded twice makes me think it has been hard-coded into the theme instead of being enqueued.
I'm not familiar with the Responsive theme, but I note that you are the author of the child them you are using. Please ensure you are loading jQuery the correct way in your child theme. If it's not your child theme that's loading jQuery incorrectly then it is most likely the Responsive theme, in which case you will need to raise a ticket with that theme's author. Please see:
http://codex.wordpress.org/Function_Reference/wp_enqueue_script