Use an anchor link to open an iframe inside a WordPress page

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I would approach this one of two ways:

  1. Use a target attribute in the link to open it in an iframe (not universal across browsers)
  2. Use JavaScript to replace the src attribute on your iframe

Option 1:

<a href="https://wordpress.stackexchange.com/questions/118983/somethirdpartysite.com/reg" target="thirdparty">Register</a>
<iframe name="thirdparty"></iframe>

Option 2:

<a href="https://wordpress.stackexchange.com/questions/118983/somethirdpartysite.com/reg" class="iframeit">Register</a>
<iframe src="#" name="thirdparty"></iframe>

<script>
     $('.iframeit').click(function(event) {
         event.preventDefault();

         var theSrc = $(event.target).attr('href');

         $('iframe[name="thirdparty"]').attr('src',theSrc);
     });
</script>