just try to make it easy on you.
1.Pull with right Mouse Clicked over a little extended Area of images, so you get the whole section marked:
2. Check Page Source Code for all CLASS-Definitions within the MAIN DIV-Section related:
3. Check the CSS-Section related to and set the top/bottom margins as well as paddings to '0'
It may take a little trying, but it should work.
BUT BE CAREFULL, any such changes will have effect on ALL Section wich are controlled by the CSS Content changed.
It therefore may be better to write a CUSTOM CSS Command directly into the DIV Section you place the images.
Using Mozlla Firebird, a CSS Analyzer can be downloaded as Add-On, then you can directly view the CSS related to whatever you need to work on!
Good Luck!
Ernie