Always seen image.
To display image on screen for browser Netscape layers may be used. The layers should touch one another to make single image. Each layer has the color of corresponding pixel of image in given position. Colors are chosen by parameter bgColor.
Sea the image above made so. Special subprogram, deciphering code-line, colors all pixels. To reduce information transferred, several pixels having the same colors join to make one of proper size.
For browser Internet Explorer layers (tag <DIV>) is used for the purpose, but it takes longer time to compare using tables. Colors are chosen by parameter "background"
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