OK thanks I will try to figure out the validation problem.
I only checked the start page for errors and never thought of checking the page containing the form.
it wasn t so much the validation nor the margins. But in the common.css the mailform had a lower z-index than an overlapping container. I however need the container to hold linkable pictures so I gues I will have to solve this with an extra css file and template file. Unless someone has another suggestion. At least I know what the problem is. Best, Frank.