Co ba la ne

<!-- Hiệu ứng hoa, lá, tuyết rơi,... cho blog -->
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  var snowdistance = "pageheight"; // Có thể thay đổi giá trị pageheight thành windowheight

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    am[i] = Math.random()*20;         // set amplitude variables
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    sty[i] = 0.7 + Math.random();     // set step variables
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        yp[i] = 0;
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