if (document.getElementById)
		document.write('<style type="text/css"> .tree { display: none; }<'+'/style>');

function tree(id) {
	if (document.getElementById(id).style.display == "block")
		document.getElementById(id).style.display="none";
	else document.getElementById(id).style.display="block";
	}

function sytleswitch(stylename) {
	document.getElementById('style').href = stylename;
	}