Encoding URL's in JS

[eluser]Unknown[/eluser]
I have form data I need to send to a PHP script via an XmlHttpRequest. I don't trust JS validation for a second, so I use encode() to urlencode field values, and let PHP deal with it later.

Problem is, CI for some reason decode's the url, and throws an error.

*I* should be the one to decode the url string, not CI. Any suggestions?