This is more functional than anything, as the rates didn't change or anything, but I made a good number of changes to the resource conversion area - some to help prevent cheating, some to make things easier on you.

Convenience:
- You can now convert multiple resources at once (some oil, some cotton, etc).

Security:
- You now have to enter a captcha code at the bottom before you can convert.
- The script will pause for a few seconds before it runs to prevent the double-convert trick that would otherwise be discovered and exploited.

Please play with it and let me know if you see any bugs or if you find a way to get around any of the security measures.