// Set how often home page changes - in seconds (recommended period is 86400 for 24 hours)
$lockperiod = 86400;
$filename = array ();
$filename[0] = 'coldwater_aquarium_care.html';
$filename[1] = 'coral_reef_care_tanks_aquarium.html';
$filename[2] = 'aquarium_care_fish_freshwater.html';
$filename[3] = 'aquarium_care_guide.html';
$filename[4] = 'aquarium_care_saltwater.html';
$filename[5] = 'aquarium_care.html';
$filename[6] = 'aquarium_fish_care.html';
$filename[7] = 'aquarium_plant_care.html';
$filename[8] = 'care_for_a_coral_aquarium.html';
$filename[9] = 'care_for_aquarium_live_plants.html';
$filename[10] = 'care_freshwater_aquarium.html';
$filename[11] = 'caring_for_aquarium_plants.html';
$filename[12] = 'how_to_care_for_aquarium_catfish.html';
$filename[13] = 'how_to_care_for_aquarium_fish.html';
$filename[14] = 'aquarium_care_goldfish.html';
$filename[15] = 'freshwater_aquarium_care.html';
$filename[16] = 'guppy_care_freshwater_aquarium.html';
$filename[17] = 'home_aquarium_care.html';
$filename[18] = 'taking_care_of_coral_aquarium.html';
$filename[19] = 'sand_shark_aquarium_care.html';
$filename[20] = 'saltwater_aquarium_care.html';
$filename[21] = 'saltwater_aquarium_care_tips.html';
$filename[22] = 'marine_aquarium_care.html';
$filename[23] = 'fifty_five_gallon_fresh_water_aquarium.html';
$filename[24] = 'aquarium_acrylic_care_kit.html';
$randpos = (intval(time() / $lockperiod)) % 25;
$filepath = $filename[$ran
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