This is some javascript to modify DNS records on my.rackspace.com .

my.rackpace.dns.js

//You have to paste in each one individually since they reload the entire page on submit instead of doing ajax.

$("input[name=host]")[0].value = "REPLACE_WITH_DOMAIN"
$('select[name=record-type]').attr("selectedIndex",0)  //A
$("input[name=target]")[0].value = "REPLACE_WITH_IP"
$("input[name=recordAdd]")[0].click();

$("input[name=host]")[0].value = "REPLACE_WITH_DOMAIN"
$('select[name=record-type]').attr("selectedIndex",2)  //CNAME
$("input[name=target]")[0].value = "REPLACE_WITH_OTHER_DOMAIN"
$("input[name=recordAdd]")[0].click();


$("input[name=host]")[0].value = "REPLACE_WITH_DOMAIN";
$("input[name=priority]")[0].value = "10" //MX Value
$("input[name=target]")[0].value = "REPLACE_WITH_MX VALUE"
$("input[name=recordAdd]")[0].click();