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I have two servers server1.contoso.com and server2.contoso.com and have to display content of both servers in two frames of the same frameset:

<frameset cols="50%,50%">
  <frame src="http://server1.contoso.com/invoices/index.html?open">
  <frame src="http://server2.contoso.com/invoices_new/index.html">
</frameset>

Both servers host an invoice system each. These systems cannot be put on a single server, and neither server may reverse-proxy the other.

Now I want the ExtJS grid in both frames to scroll synchronously. But I can't access the frames' content and hook into their scroll events due to cross-site scripting restrictions.

How can I circumvent this problem?

Alexander
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