$(document).ready(function(){
	// Generate a random number between and including 1 and 3
	var rand_no = Math.floor((4-1)*Math.random()) + 1;
	
	// Append the randomly generated number to the string 'photoSet' and call the entire thing 'className'
	var className = 'photoSet' + rand_no;
	
	// Add this new className to the div that has the ID homePhotoBoard
	$("#homePhotoBoard").addClass(className);
});