Cascading Style Sheets allows you to separate your web sites design from it's content. All the design elements (colors, fonts, backgrounds, page layout, etc) are stored in a Cascading Style Sheet . All your web pages link to this file to get their design information. If you need to change the design, you only need to edit one file to change the design elements on your entire website. Your site is very flexible. It is easier to create pages and to maintain them. The site is more consistent since all pages get their design information from the same source.
Not only can Cascading Style Sheets be helpful to the web masters, but sometimes they can be beneficial to your users. Users with vision problems can remove your style sheet and replace it with their own style sheet. Their style sheet might enlarge text on the page or change the all text to black and all backgrounds to white. Vision impaired users who use a screen reader to access the web can remove the style sheets altogether. They get the content without a lot of design elements that are unusable to them.
So, where's the tip already? Well, here you can find a good guide to converting your old site to a new, sparkly, CSS based wonder
http://www.meyerweb.com/eric/talks/2002 ... lding.html
