var count_list = 0;

$(document).ready(
	function(){ fnInitializeList(); }
);

function fnInitializeList() {
	var num_children = $("#person-list").children().length;
	if(num_children > 1) {
		$("#person-left").click(
			function(event){
				count_list--;
				if (count_list < 0) { count_list = num_children - 1; }
				fnShiftList(count_list);
			}
		);
		$("#person-right").click(
			function(event){
				count_list++;
				if (count_list == num_children) { count_list = 0; }
				fnShiftList(count_list);
			}
		);
	} else {
		$("#person-left").css("display", "none");
		$("#person-right").css("display", "none");
	}
}

function fnShiftList(param_num) {
	count_list = param_num;
	var width_item = 274;
	var num_children = $("#person-list").children().length;
	var x_dest;
	x_dest = -(param_num * width_item);
	$("#person-list").animate({ marginLeft: x_dest + "px" }, 500 );
}