This is a pretty common issue with file upload and processing. I suggest using either a Java or Flash based file uploader that offers a status for each file. the asfusion one is a good example of how you can upload and process each image. Once the image is uploaded and the script is run to resize, it will post back either a url or what I have done is run a javascript command that gets the image and loads it into DOM. Unfortunately there is no way that I know of to do this in ColdFusion and javascript without a bunch of AJAX requests checking every second or two to get a response from the server about how many files are in a directory. It could be fine but I think there is a better way than tying up the server with a cfdirectory script.
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