Make input of type field send data in base64 rather than binary

I'm writing a simple upload form in html4. It's a very simple process, usually. The problem I'm running into, is for the image data, the server is expecting base64 and will process anything I send it as base64, resulting in corrupt images. Is there some kind of attribute I can set for my form? If not, could I set up some javascript to encode the data into base64 before sending it to the server?
Curtis LongAsked:
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Dave BaldwinFixer of ProblemsCommented:
If you are using a standard HTML file upload form, you will have to make it a two-part process.  Upload to your server side page, encode it there and pass it on.  There is nothing in the standards I can find that will allow you to do anything to the file stream to change the format or content when you click on submit.  'base64' is not mentioned anywhere in the standards.
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Curtis LongAuthor Commented:
Looks like this is going to have to be a feature for a future release after we get the server to accept binary data.
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