Add Ajax file upload capabilities to SHtml, preferably using http://valums.com/ajax-upload/
as a front-end "working use case".
SHtml calling interface could be:
def ajaxFileUpload(func: (FileParamHolder) => Unit, jsFunc : Call, func : (String) => JsCmd, attrs : (String, String)*)
This would be consistent with other ajax interfaces and with file upload (non-Ajax).
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