function log_open_button() {
	var od = document.getElementById('login_dialog');
	od.style.top = window.screen.height / 2 - 200;
	od.style.left = window.screen.width / 2 - 150;
	od.style.display = "";
}

function log_close_button() {
	document.getElementById('login_dialog').style.display = "none";
	if (document.getElementById('log_action')) document.getElementById('log_action').value = '';
}