$(document).ready(function(){
	var show_per_page = 10;
	var number_of_items = $('#content').children().size();
	var number_of_pages = Math.ceil(number_of_items/show_per_page);
	$('#current_page').val(0);
	$('#show_per_page').val(show_per_page);
	var navigation_html = '<a class="previous_link" href="javascript:previous();"> </a>';
	var current_link = 0;
	while(number_of_pages > current_link){
		navigation_html += '<a class="page_link" href="javascript:go_to_page(' + current_link +')" longdesc="' + current_link +'">'+ (current_link + 1) +'</a>';
		current_link++;
	}
	navigation_html += '<a class="next_link" href="javascript:next();"> </a>';

	$('#page_navigation').html(navigation_html);
	$('#page_navigation .page_link:first').addClass('active_page');
	$('#content').children().css('display', 'none');
	$('#content').children().slice(0, show_per_page).css('display', 'block');
});

function previous(){
	new_page = parseInt($('#current_page').val()) - 1;
	if($('.active_page').prev('.page_link').length==true){
		go_to_page(new_page);
	}
}
function next(){
	new_page = parseInt($('#current_page').val()) + 1;
	if($('.active_page').next('.page_link').length==true){
		go_to_page(new_page);
	}
}
function go_to_page(page_num){
	var show_per_page = parseInt($('#show_per_page').val());
	start_from = page_num * show_per_page;
	end_on = start_from + show_per_page;
	$('#content').children().css('display', 'none').slice(start_from, end_on).css('display', 'block');
	$('.page_link[longdesc=' + page_num +']').addClass('active_page').siblings('.active_page').removeClass('active_page');
	$('#current_page').val(page_num);
}