Thank you all for your messages.

It's the first time I use this forum and I have to say that it's very friendly and useful.

I tried to put the <H1> Tags as XXXXX said, but now there is a big gap between the H1 Titles and the text below these Titles. Please check the link below and you will see what I mean:
www.select-print.org/index2.html


Coming back to the message sent by Iany:
"Something that would help with your SEO is if you validate your html. None of your images have alt tags completed either. "

I am currently using 'alt tags' on all my images. is there a mistake in the tags ? If someone could also advise me on this, I would really appreciate.

Laurent