var cpages = new Array();
cpages[0]  = "Images/cateringbooklet/catering-0.jpg";
cpages[1]  = "Images/cateringbooklet/catering-1.jpg";
cpages[2]  = "Images/cateringbooklet/catering-2.jpg";
cpages[3]  = "Images/cateringbooklet/catering-3.jpg";
cpages[4]  = "Images/cateringbooklet/catering-4.jpg";
cpages[5]  = "Images/cateringbooklet/catering-5.jpg";
cpages[6]  = "Images/cateringbooklet/catering-6.jpg";
cpages[7]  = "Images/cateringbooklet/catering-7.jpg";

function cnext_page() {
	if ((cget_cur_page()+1 == 8)) {
		cset_cur_page(0);
		cchange_image(cpages[0]);
	} else {
		cchange_image(cpages[(cget_cur_page()+1)]);
		cset_cur_page((cget_cur_page()+1));
	}
}

function cprev_page() {
	if ((cget_cur_page()-1 == -1)) {
		cset_cur_page(7);
		cchange_image(cpages[7]);
	} else {
		cchange_image(cpages[(cget_cur_page()-1)]);
		cset_cur_page((cget_cur_page()-1));
	}
}

function cget_cur_page() {
	return parseInt(document.getElementById('ccur_page').innerHTML);	
}

function cset_cur_page(p) {
	document.getElementById('ccur_page').innerHTML = p;
}

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