function stromKlik() {
	var ul = this.parentNode.getElementsByTagName("ul")[0];
	if (ul!=null) ul.style.display = ul.style.display=="none" ? "block" : "none";
}

function stromInit() {
	if (document.getElementsByTagName) {
		var li = document.getElementsByTagName("li");
		for (var i=0; i<li.length; i++) li[i].getElementsByTagName("div")[0].onmousedown = stromKlik;
		document.getElementById("koren").onmouseup = stromKlik;
		var ul = document.getElementsByTagName("ul");
		for (var i=0; i<ul.length; i++) ul[i].style.display="none";
	}
}