Iphone Photo upload

I am writing an application in Javascript using the phonegap framework on iphone. The application is strictly written using HTML5 CSS and Javascript on the client side The application is strictly written in Python in Google App Engine on the server side The requirement is to take a photo, upload it to a blob() in google app engine and serve it to web requests I have already realized : 1) Take a photo with the iphone 2) display it on the screen in an img tag 3) Resize the image using the Javascript Pixastic library 4) Convert the resulting canvas tag back into an img tag I can also : 5) Upload the non-resized image in a blob in google app engine 6) Service the non resized image in a blob to a web page request I have no solution for : a) Uploading the resized image into a blob b) Service the resized image in a blob to a web page request There is something very obvious and simple I do not understanding in the process and am ready to pay for a working example and an explanation on how this works.