yes indeed all id's has to be unique on the page and style can be set inside the CSS file starting with the #id_name sign.
if you need to use the same style more then once on the same page you can create classes, referenced inside the CSS file with a .class_name.
in you case there (the text file) the #infoboxleft has the same style as the #infoboxright, so you can convert that into one class .side_box_holder and same with the other ones that goes inside it. (e.g. .titlebox, .imagebox) |