Warning: include(includes/header.php): failed to open stream: No such file or directory in /Users/ec/Sites/index.php on line 1

Warning: include(): Failed opening 'includes/header.php' for inclusion (include_path='.:/usr/lib/php') in /Users/ec/Sites/index.php on line 1
<?
$inc=$_GET["inc"];
if($inc=="") { 
	$inc="intro";
}
?>

Notice: Undefined variable: inc in /Users/ec/Sites/index.php on line 8

Warning: include(content/.html): failed to open stream: No such file or directory in /Users/ec/Sites/index.php on line 8

Warning: include(): Failed opening 'content/.html' for inclusion (include_path='.:/usr/lib/php') in /Users/ec/Sites/index.php on line 8

Warning: include(includes/footer.php): failed to open stream: No such file or directory in /Users/ec/Sites/index.php on line 9

Warning: include(): Failed opening 'includes/footer.php' for inclusion (include_path='.:/usr/lib/php') in /Users/ec/Sites/index.php on line 9