If I use the ImageShack API just in a form like this:
<form method="post" enctype="multipart/form-data" action="http://www.imageshack.us/upload_api.php">
<p><input type="file" name="fileupload"></p>
<p><input type="text" name="key" value="Your_Developer_Key"></p>
<p><input type="submit" value="Go"></p>
</form>
the browser gets taken to an XML doc, which has the image URL, but is no use because I’m no longer on my site. I’ve tried loading it in an iFrame and that works, but I can’t access it because it’s cross-domain.
A Http Post in jquery won’t work because I can’t send a file in it. I don’t know any PHP so using that would take lots of time to learn & setup etc. Do I have any other options?
You mention you know Ruby on Rails.
Posting a file with Ruby is rather simple. See: Ruby: How to post a file via HTTP as multipart/form-data?