I still cant upload the webpages

I can't believe this, today at school I converted all the webpage versions and practices into jpg format from there original photoshop format, which is what blogger and a friend told me to do. However they still will not work, which I don't understand why. I am going to talk to Miss about it in the lesson tomorrow, and try to get a demonstration aswell just to make sure. You wouldn't think it would be that difficult just to upload some images would you?