Uploading a File with AppleScript via JavaScript

Hi everybody,
being new to AppleScripting and JavaScripting I'm faced with the following problem:
Is it possible to make AppleScript to input the path for a file to be uploaded via JavaScript? If yes, what should be the correct Path Format and how to wrap it up the JavaScript action into AppleScript? I've tried a few comands but to no success.
On the webpage in question, there's a "Choose" button, that is defined as follows:
<input type="file" class="gwt-FileUpload" name="swfFile">
I've been trying to use the following syntax:
do JavaScript "document.getElementsByName('swfFile')[0].value('Macintosh HD:Users:myaccount:Desktop:Scrapbook:!动画.swf')" in document 1
as well as this one, where the Path is definitelly understood by shellscript:
do JavaScript "document.getElementsByName('swfFile')[0].value('/Users/myaccount/Desktop/Scrap book/!动画.swf')" in document 1
The name of the file is (and must remain) in chinese, but for testing purposes I have also tried files with english names, without success.
Currently I'm using a solution with JavaScript comand:
do JavaScript "document.getElementsByName('swfFile')[0].click()" in document 1
to click the finder window to browse for the file, and manipulating keystrokes by using System Events to find the right file, but it's not infallible with a number of files and it's hardly an ellegant sollution.
Any idea what I'm doing wrong?
Cheers!

@twtwtw
the do JavaScript "document.forms[0].submit()" command didn't work, so I kept the original way of submitting by clicking the button. The submitting part works, but not the input file part.
That's the code I used
    tell application "Safari"
        do JavaScript "document.getElementById('gwt-uid-13').value='on'" in document 1
        do JavaScript "document.forms[0].elements['swfFile'].value=" & "'" & SWFFilePath & "'" in document 1
        do JavaScript "document.getElementsByClassName('gwt-SubmitButton')[0].click()" in document 1
        delay 1
    end tell
with SWFFilePath set as the POSIX path as well as the default file format
Macintosh HD:Users:myaccount:Desktop:Scrapbook:!动画.swf'
but it did not work.
If you've got the time, feel free to upload an .swf. The service is free and the server delats uploaded files after 15 min. (if you don't have any, you may try an empty .txt file instead - it won't get converted, but the point is just to get it into the input box).
In the meantime, I'll have a look at adayzdone's suggestion. It's not perfect (the downside being that it requires the window to be active, so I can't run the script in the background or with my screensaver & password on), but it's still more reliable than my sollution with navigating arrowkeyes.

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