From http://www.dcpagesapps.com/developer-resources/web-development/26-adwords-conversion-on-click-event

adwords_ajax_form_success.js

<!-- Google Code for Contact Page Conversion Page -->
<script type="text/javascript">
/* <![CDATA[ */
var google_conversion_id = XXXXXXXXXXXX;
var google_conversion_language = "en";
var google_conversion_format = "3";
var google_conversion_color = "ffffff";
var google_conversion_label = " XXXXXXXXXXXX";
var google_conversion_value = 0;
/* ]]> */
</script>
<script type="text/javascript" src="http://www.googleadservices.com/pagead/conversion.js">
</script>
<noscript>
<div style="display:inline;">
<img height="1" width="1" style="border-style:none;" alt="" src="http://www.googleadservices.com/pagead/conversion/XXXXXXXXXXXX/?label=XXXXXXXXXXXX&amp;amp;guid=ON&amp;amp;script=0"/>
</div>
</noscript>


var image = new Image(1,1);
image.src = "http://www.googleadservices.com/pagead/conversion/XXXXXXXX/?label=XXXXXXXX&amp;amp;guid=ON&amp;amp;script=0";

$(document).ready( function() {
 $("#emailLink").click( function() {
 
 $(this).parent().append('<div style="display:inline;"><img height="1" width="1"   style="border-style:none;" alt=" src="http://www.googleadservices.com/pagead/conversion/XXXXXXXX/?value=0&amp;amp;label=XXXXXXXX&amp;amp;guid=ON&amp;amp;script=0"/></div>');
 _gaq.push(['_trackPageview','/email']);
 });
});