I had a quick look at the site and see that you are using layers to set the site out. Given that it is a pretty simple site with a lot of solid colour around the edges I'd use tables instead.
The site could easily be centred in a table about 745/750 px wide which means for most users other than those few using 640 x 480 there will be no need for horizontal scrolling. The image you want can then be used as a background image in a central table cell with the text as content in the same cell.
Worth a go and you avoid the problems of older browsers not understanding Layers.