I got this from a couple of forums, but it will only work for sites inside your domain, not for external websites framed in the iframe because of security reasons.
<iframe name="ifr" id="tgiframe" style="width: 400px; height: 300px" ></iframe>
<a href="#" onclick="sendmail();">send this page to me!</a>
<script type="text/javascript">
function sendmail(){
lnk = document.getElementById('tgiframe').contentWindow.location.href;
window.open('mailto:add@some.com?Subject=link!!&body='+lnk);
}
</script>
http://www.scriptingok.com/forum/t5_1247-Send-image-to-given-email-address