235035 oscommerce customisation

I have an existing oscommerce store that requires some modifications, these are as follows - colour/layout change, for each category/subcategory visited (currently 11 categories) the faded background and colour of the info box heading, borders and backgrounds will change to a predefined colour. Ideally I would like to able to control the colour associated with each category from the admin in case more categories are added in future. There will also be a default colour for information pages visited which is the colour currently being used, but the ability to change in the future would be good. So the parts to change colour for each category visited would be - page background infobox heading infobox background infobox border subcategory text box border (same as infobox border) subcategory text box background (same as infobox border)