<?

/* 
This php code will keep track of what page of the timeline the user was viewing last in the session.
*/

$seconds_in_year = 31536000;

if ($year)	{	//Check to see if there's a requested year in the query string
	$theYear = $year;
}
elseif ($cts_time_year) { //Check for cookie
	$theYear = $cts_time_year;
}
else	{
	$theYear = 0;
}

$checkedYear = 0;
// Do some checking for bad years in the query or cookie
 if(settype($theYear, "integer"))	{ // It's really an integer
 	if(($theYear >=1900) && ($theYear <=2000))	{	// If it's in the correct range
		$checkedYear = 10 * floor($theYear / 10);	// Convert to nearest decade
	}
}

$checkedYear = max($checkedYear, 1900);	// If checkedYear is 0, make it 1900

// Set cookie, no-caching headers
header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the past
header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); 
                                                      // always modified
header ("Cache-Control: no-cache, must-revalidate");  // HTTP/1.1
header ("Pragma: no-cache");                          // HTTP/1.0
// header("Set-Cookie: cts_time_year=$checkedYear; expires=''");
setcookie ("cts_time_year", "$checkedYear");


// include("$checkedYear.html");

header ("Location: $checkedYear.html");

?