<img src="images/header.jpg>
In that case, you need to make sure that your zip file
contains both the actual 'images' folder, and inside
that, the header.jpg. If you just zip up the header.jpg,
when we unzip it your HTML is still looking for a folder
called 'images' which does not exist.
So check where your HTML page expects to find the images,
and make sure the zip file contents will match that.
Also, make sure you are actually using the zip format, rather than an alternative compression method like .rar files. Promothon only supports .zip files.
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