for loop Table Generation

Source code:

<? require_once('site.php');?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html>
<head>
	<title> Make Table </title>
	<link rel="stylesheet" type="text/css" href="test.css" />
</head>
<body><div id="page">
	<div id="headder">
		<h1> for loop Table Generation </h1>
	</div>

<div id="main-area">
		<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
			Enter Number of Rows: <input class="styled" name="rows" type="text" size="4" maxlength="2">
			and columns: <input class="styled" name="cols" type="text" size="4" maxlength="1">
			<input type="submit" name="submit" value="Draw Table">
		</form>

<?php
			if (isset($_POST['submit']))
				{
				echo "<table>";

//				if ($_POST['rows'] < 1) { $rows = 1; }
//				elseif ($_POST['rows'] > 99) { $rows = 99; }
//				else { $rows = $_POST['rows']; }
				$rows = min(max($_POST['rows'], 1), 99);

//				if ($_POST['cols'] < 1) { $cols = 1; }
//				elseif ($_POST['cols'] > 99) { $cols = 9; }
//				else { $cols = $_POST['cols']; }
				$cols = min(max($_POST['cols'], 1), 9);

$bg = "dark";

echo "<tr>";
				for ($c = 1; $c <= $cols; $c++)
					{
					if ($c == 1) {echo "<th class=\"tl\">Header $c</th>";}
					elseif ($c == $cols) {echo "<th class=\"tr\">Header $c</th>";}
					else {echo "<th>Header $c</th>";}
					}
				echo "</tr>";
				for ($r = 1; $r <= $rows; $r++)
					{
					echo "<tr>";
					for ($c = 1; $c <= $cols; $c++)
						{
						if ($bg == "dark")
							{
							if (($r == $rows) && ($c == 1)) {echo "<td id=\"tddark\" class=\"bl\">&nbsp;</td>";}
							elseif (($r == $rows) && ($c == $cols)) {echo "<td id=\"tddark\" class=\"br\">&nbsp;</td>";}
							else {echo "<td id=\"tddark\">&nbsp;</td>";}
							}
						if ($bg == "light")
							{
							if (($r == $rows) && ($c == 1)) {echo "<td id=\"tdlight\" class=\"bl\">&nbsp;</td>";}
							elseif (($r == $rows) && ($c == $cols)) {echo "<td id=\"tdlight\" class=\"br\">&nbsp;</td>";}
							else {echo "<td id=\"tdlight\">&nbsp;</td>";}

//							echo "<td id=\"tdlight\">&nbsp;</td>";
							}
						}
					echo "</tr>";
					if ($bg == "dark")
						{
						$bg = "light";
						}
					elseif ($bg == "light")
						{
						$bg = "dark";
						}
					}
				echo "</table>";
				}
		?>
	</div>
        <div class="clearfloat">
        </div>
</div></body>
</html>