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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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-    =>  =>  .
    jQuery: jquery-1.3.2.js
       :  .
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-    =>  =>  .
       " ( )".
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-    =>  =>  .
   " ( )",  .
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-    =>    => .
 ""  "<img src="/images/online.png">".
 ""  "<img src="/images/offline.png">".
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-   ,      - "black".
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