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1.        " ".
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2.    .  ""    " ".
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3.    .  "  (CSS)"    "  (CSS)".
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4.      "".
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5.     .  "".
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6.    =>  =>  .
-   jQuery: jquery-1.3.2.js
-      : 
-   <!DOCTYPE>: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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7.    =>  =>  .
-    " ( )".
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8.    =>    => .
-  ""  "<img src="/design/on.png" />".
-  ""  "<img src="/design/off.png" />".
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