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var MESSAGE_TIMEOUT = 4000;

function changeTab() {
	var hashtype = window.location.hash.substr(1,3);
	if(hashtype != "tab") return;
	var id = window.location.hash.substr(4);
	var tabs = document.querySelectorAll("#tabs-panel > ul > li");
	for(var i=0; i < tabs.length; i++) {
		if(i == id-1) tabs[i].classList.add("active"); // Doesn't work with IE < 10 (and Opera Mini), but who cares?
		else tabs[i].classList.remove("active");
	}

}

function showMessage(type, msg) {
	var msg_box = document.getElementById(type+"-box");
	msg_box.style.display = "initial";
	var msg_list = msg_box.firstElementChild.firstElementChild;
	msg_list.innerHTML = "<li>" + msg + "</li>\n" + msg_list.innerHTML;

	window.setTimeout(hideMessage.bind(null, type), MESSAGE_TIMEOUT);
}

function hideMessage(type) {
	var msg_box = document.getElementById(type+"-box");
	var msg_list = msg_box.firstElementChild.firstElementChild;
	var item = msg_list.lastElementChild;
	msg_list.removeChild(item);

	if(msg_list.children.length <= 0)
		msg_box.style.display = "none";
}

function showError(msg) {
	showMessage("error", msg);
}

function showInfo(msg) {
	showMessage("info", msg);
}