function show_popup(id) {
	var div = document.getElementById(id);
	if (div) {
		div.style.display = 'block';
	}
	document.onkeydown = function (event) {
		var key;
		if (window.event && window.event.keyCode)
			key = window.event.keyCode;
		else if (event && event.keyCode)
			key = event.keyCode;
		else if (event && event.which)
			key = event.which;
		if (key == 27)
			hide_popup(id);
	};
	return false;
}

function hide_popup(id) {
	var div = document.getElementById(id);
	if (div) {
		div.style.display = 'none';
	}
	document.onkeypress = null;
	return false;
}