var pages = new Array();
pages[0]  = "Images/cakebooklet/cakes-0.jpg";
pages[1]  = "Images/cakebooklet/cakes-1.jpg";
pages[2]  = "Images/cakebooklet/cakes-2.jpg";
pages[3]  = "Images/cakebooklet/cakes-3.jpg";
pages[4]  = "Images/cakebooklet/cakes-4.jpg";
pages[5]  = "Images/cakebooklet/cakes-5.jpg";
pages[6]  = "Images/cakebooklet/cakes-6.jpg";
pages[7]  = "Images/cakebooklet/cakes-7.jpg";
pages[8]  = "Images/cakebooklet/cakes-8.jpg";
pages[9]  = "Images/cakebooklet/cakes-9.jpg";
pages[10]  = "Images/cakebooklet/cakes-10.jpg";
pages[11]  = "Images/cakebooklet/cakes-11.jpg";
pages[12]  = "Images/cakebooklet/cakes-12.jpg";
pages[13]  = "Images/cakebooklet/cakes-13.jpg";
pages[14]  = "Images/cakebooklet/cakes-14.jpg";
pages[15]  = "Images/cakebooklet/cakes-15.jpg";
pages[16]  = "Images/cakebooklet/cakes-16.jpg";
pages[17]  = "Images/cakebooklet/cakes-17.jpg";

function next_page() {
	if ((get_cur_page()+1 == 18)) {
		set_cur_page(0);
		change_image(pages[0]);
	} else {
		change_image(pages[(get_cur_page()+1)]);
		set_cur_page((get_cur_page()+1));
	}
}

function prev_page() {
	if ((get_cur_page()-1 == -1)) {
		set_cur_page(17);
		change_image(pages[17]);
	} else {
		change_image(pages[(get_cur_page()-1)]);
		set_cur_page((get_cur_page()-1));
	}
}

function get_cur_page() {
	return parseInt(document.getElementById('cur_page').innerHTML);	
}

function set_cur_page(p) {
	document.getElementById('cur_page').innerHTML = p;
}

function change_image(i) {
	document.getElementById('cake_page').innerHTML = '<img src="' + i + '">';	
}