Sending form elements to both Marketo and Eloqua

We have a client that asked us to "cut and paste" some Eloqua JavaScript onto our Marketo lead form so that the data can go directly into their Salesforce account.

As I understand form code, this is not possible without advanced scripting -- AJAX and/or possibly not even hosting the form on Marketo.

Anyone accomplish something like this with a simple cut/paste into a Marketo page?

Thanks,

Gonzo