Images

Here are some tips on using images in your Web site.

Set Image Sizes
Always set image sizes in the image tags. There are two advantages to setting image sizes:

Increases the speed at which your page renders in web browsers. Images are downloaded, after the page's text content is displayed on the screen. The page will appear to download quicker than it really has
If graphics are turned off by the user, the alternative text will be visible in the empty image frame

Alternative Text
Set alternative text in images. There are two advantages to setting alternative text in image tags:

If image sizes are set, and the user has turned off graphics, the alternative text will appear in the empty image
The alternative text will appear in a pop-up window when the cursor hovers over the graphic. Currently, this only works in the Internet Explorer browser

Optimize Image File Sizes
Optimize image file sizes to help minimize the download time of your Web page and improve the usability of your site.