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div.leer {
	clear:			both;
	text-align:		center;
        margin: 0 auto;
}

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<?php
	$f = file('data.dat');

	$out = $f[0];
	$out2 = explode('|', $out);

	$j = 1;

	echo '<div class="leer">';

	for ($i = 0; $i <= 51; $i++) {
		if ($i / 7 / $j == 1) {
			echo '</div><div class="leer">';
			$j++;
		};
		
		$k = $i + 1;
		
		if ($out2[$i] == 0) {
			echo '<div class="red">KW '.$k.'</div>';
		}
		
		else {
			echo '<div class="green">KW '.$k.'</div>';
		};
	};

	echo '</div>';
?>

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body {
	background-color:	#D9D9D9;
	margin-left:		10px;
	margin-top:		50px;
	margin-right:		0px;
	margin-bottom:		0px;
}

div{
	color:			#000000;
	float:			left;
	font-size:		18px;
	font-family:		Tahoma, Arial, Sans-Serif;
	text-decoration:	none;
	text-align:		center;
	vertical-align:		top;
	margin-left:		1px;
	margin-top:		1px;
	margin-right:		2px;
	margin-bottom:		0px;
}

div.green {
	background-color:	#189C18;
	font-weight:		bold;
	height:			40px;
	width:			80px;
}

div.red {
	background-color:	#DE1818;
	font-weight:		none;
	font-style:		italic;
	height:			40px;
	width:			80px;
}

div.leer {
	clear:			both;
	text-align:		center;
}