Basic rule of web design -easy to navigate

Your web site should be easy to navigate

 

All of your hyperlinks should be clear to your visitors. Graphic images, such as buttons or tabs, should be clearly labeled and easy to read. Your web graphic designer should select the colors, backgrounds, textures, and special effects on your web graphics very carefully. It is more important that your navigational buttons and tabs be easy to read and understand than to have "flashy" effects.

Link colors in your text should be familiar to your visitor (blue text usually indicates an unvisited link and purple or maroon text usually indicates a visited link), if possible. If you elect not to use the default colors, your text links should be emphasized in some other way (boldfaced, a larger font size, set between small vertical lines, or a combination of these). Text links should be unique -- they should not look the same as any other text in your web pages. You do not want people clicking on your headings because they think the headings are links.

Your visitors should be able to find what they are looking for in your site within three clicks. If not, they are very likely to click off your site as quickly as they clicked on.
Source: http://www.grantasticdesigns.com/5rules.html