var activeTab = 1;

function toggleFlipbook(nid) {
	// Turn off the active tab
	var a = document.getElementById("flipbook_tab_" + activeTab);
	a.className = "flip_tab";
	// And hide the content
	var a = document.getElementById("flipbook_content_" + activeTab);
	a.style.display = "none";

	activeTab = nid;

	// Turn on the next tab on
	var n = document.getElementById("flipbook_tab_" + activeTab);
	n.className = "active_flip_tab";
	// 
	var n = document.getElementById("flipbook_content_" + activeTab);
	n.style.display = "block";
}