html, css - weird invisible margin below pictures

Question

I\'m going bananas here, somehow below all of my images in my page there is a gap, a margin which isn\'t there in the code. Even Firebug can\'t see it but Firefox and Safari

Answer 1

Try to change the DOCTYPE section to:

You can also check this: http://www.emailonacid.com/blog/details/C18/12_fixes_for_the_image_spacing_in_html_emails