//defer the instantiation of Lightbox. Call when the page has finished loading.
init = function(){
   //creating a data source object
  var dataSource = {
	 	photo1:{url:"day1/images/DSC_0201.jpg"},
	 	photo2:{url:"day1/images/DSC_0202.jpg"},
	 	photo3:{url:"day1/images/DSC_0203.jpg"},
	 	photo4:{url:"day1/images/DSC_0212.jpg"},
	 	photo5:{url:"day1/images/DSC_0214.jpg"},
		photo6:{url:"day1/images/DSC_0217.jpg"},
		photo7:{url:"day1/images/DSC_0221.jpg"},
		photo8:{url:"day1/images/DSC_0223.jpg"},
		photo9:{url:"day1/images/DSC_0225.jpg"},
		photo10:{url:"day1/images/DSC_0226.jpg"},
		photo11:{url:"day1/images/DSC_0228.jpg"},
		photo12:{url:"day1/images/DSC_0234.jpg"},
		photo13:{url:"day1/images/DSC_0236.jpg"},
		photo14:{url:"day1/images/DSC_0243.jpg"},
		photo15:{url:"day1/images/DSC_0244.jpg"},
		photo16:{url:"day1/images/DSC_0249.jpg"},
		photo17:{url:"day1/images/DSC_0253.jpg"},
		photo18:{url:"day1/images/DSC_0256.jpg"},
		photo19:{url:"day1/images/DSC_0257.jpg"},
		photo20:{url:"day1/images/DSC_3839.jpg"},
		photo21:{url:"day1/images/DSC_3843.jpg"},
		photo22:{url:"day1/images/DSC_3846.jpg"},
		photo23:{url:"day1/images/DSC_3871.jpg"},
		photo24:{url:"day1/images/DSC_3883.jpg"},
		photo25:{url:"day1/images/DSC_3913.jpg"},
		photo26:{url:"day1/images/DSC_3916.jpg"},
		photo27:{url:"day1/images/DSC_3917.jpg"},
		photo28:{url:"day1/images/DSC_3918.jpg"},
		photo29:{url:"day1/images/DSC_3919.jpg"},
		photo30:{url:"day1/images/DSC_3930.jpg"},
		photo31:{url:"day1/images/DSC_3931.jpg"},
		photo32:{url:"day1/images/DSC_3933.jpg"},
		photo33:{url:"day1/images/DSC_3946.jpg"},
		photo34:{url:"day2/images/DSC_0277.jpg"},
		photo35:{url:"day2/images/DSC_0278.jpg"},
		photo36:{url:"day2/images/DSC_0285.jpg"},
		photo37:{url:"day2/images/DSC_0289.jpg"},
		photo38:{url:"day2/images/DSC_0298.jpg"},
		photo39:{url:"day2/images/DSC_0304.jpg"},
		photo40:{url:"day2/images/DSC_0305.jpg"},
		photo41:{url:"day2/images/DSC_0308.jpg"},
		photo42:{url:"day2/images/DSC_0321.jpg"},
		photo43:{url:"day2/images/DSC_0324.jpg"},
		photo44:{url:"day2/images/DSC_0328.jpg"},
		photo45:{url:"day2/images/DSC_0329.jpg"},
		photo46:{url:"day2/images/DSC_0330.jpg"},
		photo47:{url:"day2/images/DSC_0376.jpg"},
		photo48:{url:"day2/images/DSC_0382.jpg"},
		photo49:{url:"day2/images/DSC_0384.jpg"},
		photo50:{url:"day2/images/DSC_0387.jpg"},
		photo51:{url:"day2/images/DSC_0388.jpg"},
		photo52:{url:"day2/images/DSC_0389.jpg"},
		photo53:{url:"day2/images/DSC_0390.jpg"},
		photo54:{url:"day2/images/DSC_0392.jpg"},
		photo55:{url:"day2/images/DSC_0393.jpg"},
		photo56:{url:"day2/images/DSC_0394.jpg"},
		photo57:{url:"day2/images/DSC_0395.jpg"},
		photo58:{url:"day2/images/DSC_0396.jpg"},
		photo59:{url:"day2/images/DSC_0400.jpg"},
		photo60:{url:"day2/images/DSC_0401.jpg"},
		photo61:{url:"day2/images/DSC_0403.jpg"},
		photo62:{url:"day2/images/DSC_0404.jpg"},
		photo63:{url:"day2/images/DSC_0406.jpg"},
		photo64:{url:"day2/images/DSC_0407.jpg"},
		photo65:{url:"day2/images/DSC_0412.jpg"},
		photo66:{url:"day2/images/DSC_0423.jpg"},
		photo67:{url:"day2/images/DSC_3978.jpg"},
		photo68:{url:"day2/images/DSC_3980.jpg"},
		photo69:{url:"day2/images/DSC_3983.jpg"},
		photo70:{url:"day2/images/DSC_3990.jpg"},
		photo71:{url:"day2/images/DSC_3991.jpg"},
		photo72:{url:"day2/images/DSC_3998.jpg"},
		photo73:{url:"day2/images/DSC_4001.jpg"},
		photo74:{url:"day2/images/DSC_4013.jpg"},
		photo75:{url:"day2/images/DSC_4015.jpg"},
		photo76:{url:"day2/images/DSC_4019.jpg"},
		photo77:{url:"day2/images/DSC_4041.jpg"},
		photo78:{url:"day2/images/DSC_4042.jpg"},
		photo79:{url:"day2/images/DSC_4048.jpg"},
		photo80:{url:"day2/images/DSC_4050.jpg"},
		photo81:{url:"day2/images/DSC_4057.jpg"},
		photo82:{url:"day2/images/DSC_4061.jpg"},
		photo83:{url:"day2/images/DSC_4064.jpg"},
		photo84:{url:"day2/images/DSC_4070.jpg"},
		photo85:{url:"day2/images/DSC_4071.jpg"},
		photo86:{url:"day2/images/DSC_4072.jpg"},
		photo87:{url:"day2/images/DSC_4074.jpg"},
		photo88:{url:"day2/images/DSC_4079.jpg"},
		photo89:{url:"day2/images/DSC_4083.jpg"},
		photo90:{url:"day2/images/DSC_4085.jpg"},
		photo91:{url:"day2/images/DSC_4086.jpg"},
		photo92:{url:"day2/images/DSC_4087.jpg"},
		photo93:{url:"day2/images/DSC_4094.jpg"},
		photo94:{url:"day2/images/DSC_4101.jpg"},
		photo95:{url:"day2/images/DSC_4104.jpg"},
		photo96:{url:"day2/images/DSC_4106.jpg"},
		photo97:{url:"day2/images/DSC_4115.jpg"},
		photo98:{url:"day3/images/DSC_4237.jpg"},
		photo99:{url:"day3/images/DSC_4240.jpg"},
		photo100:{url:"day3/images/DSC_4244.jpg"},
		photo101:{url:"day3/images/DSC_4245.jpg"},
		photo102:{url:"day3/images/DSC_4246.jpg"},
		photo103:{url:"day3/images/DSC_4251.jpg"},
		photo104:{url:"day3/images/DSC_4258.jpg"},
		photo105:{url:"day3/images/DSC_4259.jpg"},
		photo106:{url:"day3/images/DSC_4263.jpg"},
		photo107:{url:"day3/images/DSC_4265.jpg"},
		photo108:{url:"day3/images/DSC_4274.jpg"},
		photo109:{url:"day3/images/DSC_4276.jpg"},
		photo110:{url:"day3/images/DSC_4278.jpg"},
		photo111:{url:"day3/images/DSC_4280.jpg"},
		photo112:{url:"day3/images/DSC_4282.jpg"},
		photo113:{url:"day3/images/DSC_4284.jpg"},
		photo114:{url:"day3/images/DSC_4299.jpg"},
		photo115:{url:"day3/images/DSC_4305.jpg"}
  };

  //Instantiate a Lightbox object
  var lightbox = new YAHOO.com.thecodecentral.Lightbox({
    imageBase:'http://wwwdev.wharton.upenn.edu/alumni/inc/gallery/lightbox', 
    dataSource: dataSource
  });
}
YAHOO.util.Event.on(window, 'load', init);