Cross-domain info retrieval in microsoft dynamics crm online

Hi, i am trying to add to the lead form in microsoft dynamics crm online
My company content as an embedded content.
I will need to send my company server the lead information and load html i get back with information.
I understand that the browser blocks ajax that try to do cross-domain calls.
I saw in a blog that on microsoft dynamics products that are not online i can try to do url rewrite using IIS.
But this method is not avaialbe in the online version.

Any suggestions?
Thanks!