<script src="http://apis.google.com/js/plusone.js" type="text/javascript"></script>
<g:plusone id="googleModuloContentButton" href="http://www.mywebsite.com/?IDL=1" size="medium"></g:plusone>

gapi.plusone.render('googleModuloContentButton', {
    href: "http://www.mywebsite.com/?IDL=2"
});

<script type="text/javascript" src="https://apis.google.com/js/plusone.js">
  {parsetags: 'explicit'}
</script>