This will make the text and objects on the page appear to slide across the background without the background moving. I have mixed feeling about frames, they make navigation easy for the surfer but different browsers show frames differently than others. Your web pages may work well in one browser but might look terrible or not even show up at all in another browser. Some people get carried away with frames and make their web pages difficult, this translates to less people visiting or returning to them. Quick Loading Graphics Always remember that the larger the image on your page the slower it will download and display.
Larger images have large files sizes.
I recommend trying to keep images under 50k. The smaller the file size the faster a pages completely loads. You also have to take into consideration what color range you viewing audience is using. The default windows color range is 256 colors. Most people run at what they call high color or 16,000 color range, still their are a very few that use true color or 32 million color range.