Now you get to learn the Calibre Editor
(The basic cut and paste is easy), but invest a bit of time and learn REGEX (there are tutorials here at MR, how I learned

)
And find and Move the code block containing the Image to where it should be.
Here is a sample of what one
might look like:
Code:
<div class="h100">
<img alt="" class="h100" src="../Images9780451477903_Flameout_TX.jpg"/>
</div>
The DIV is the block (contains the image or text) class= is the look and feel control (in CSS)