<script>

document.main.subject.value = var1 + var2;

document.main.email.value = "XXXX";;



var url="javascript:void(window.location='mailto:?cc=emailaddress&subject='+document.main.subject.value+'&body='+document.main.email.value)"

link = document.getElementById('generateEmail');

link.href=url;



</script>



<a id="generateEmail" href="#"><input type="button" value="submit" onClick="function();"></a>

<textarea id="subject"></textarea>

<textarea id="email"></textarea>