function zmien(obj, color) {
	if (!color)
		var color = "#ffffff"
	obj.style.backgroundColor = color
	var cnt = obj.childNodes.length
	var chl = 0
	for (var i = 0; i < cnt; i++) {
		chl = obj.childNodes.item(i)
		if (chl != obj && chl.style)
			chl.style.color = (color == "#ffffff" ? "#046757" : "#eaeced")
	}
}