Thanks for all yours opinions !
Ian, can you tell me what's your web browser ? I check my website with adobe browserlabs and i don't see a mistake. My website is valid (xhtml and css) after tests on the W3C site.
Bigred, i know the english translation is not perfect, if i can't find anyone who help me for this task, i'll try to ask for a translation agency (250 Euros, for Tradsmith).
Tothepoint, i don't use images instead of a text, i use a font-remplacement (Cufon) for giving a smooth reading to visitors. This is completly SEO friendly and clear !
I don't know if i speak very well, excuse me for any mistake. It's easier to speak in French, for me ! Thanks again for your help.