web images :
There are two kinds of images used widely in web pages: JPEG and GIF format images.
- GIF - Used primarily for images with text and graphics, typically images that have large areas of flat color
- JPEG - Use primarily for photographs and other images with continuous color changes
Many applications produce web images including Photoshop, ImageReady, and Fireworks. For more information on web images and making them in Photoshop, go here:
http://people.artcenter.edu/~vanallen/web1/2003sp/web1_wk04b.html
tables :
Tables are used for controlling the layout of your web pages. They are a grid of cells similar to a spreadsheet. For example:
| some text | centered text |
some other text |
| bkgnd color |
For more information about tables, go here:
http://people.artcenter.edu/~vanallen/web1/2003sp/web1_wk07c.html
rollovers :
Rollovers are often used to highlight that graphics are usable as buttons that link to other web pages.
For example: 
Control-Click (or right-click) on the following two images to download them to your drive so we can use them:
For more information about rollovers, go here:
http://people.artcenter.edu/~vanallen/web1/2003sp/web1_wk08a.html