Thanks for all the comments.
All pages have now less content to prevent too much down scrolling. The content is divided into more pages.
I have yet to correct the horizontal scrolling under 800×600 resolutions. All the website is made to automatically adjust to different resolutions without having an horizontal scroll bar, but the 468×60 banner images are messing this feature. I will have to change left and right blocks or to choose smaller banners. I will correct this issue. Thanks for pointing that to me.