params from %amp; spererated url not coming through to the controller.

Hi.

I am using fusion charts and passing a data_url. The data_url param pairs are linked with the normal & character. However, the flash object url encodes the data_url before calling it, so my rails app is hit with /controller/action?key=value%amp;key2=value2

Rails seems to through the params out the window when confronted by the %amp; enstead of &.

How would you go about extracting params when they are seperated by url_encoded params, instead fo the usual & seperator.

Regards
Ivor