//tree functions
var openImg = '/css/btn/tree_open.gif';
var closeImg = '/css/btn/tree_close.gif';
   

function tree_block(b) {
	if (document.all) {
		// IE4+
		if (document.all[b]) var e = document.all[b].style;
		}
	else if (document.layers) {
		// NS4
		if (document.layers[b]) var e = document.layers[b].style;
		}
	else if (document.getElementById) {
		// (IE5+) NS6+
		if (document.getElementById(b)) var e = document.getElementById(b).style;
		}
	if (!e) e = false;
	return e;
	}
	

function tree(b) {
	var e = tree_block(b);
	if(e.display=='block') {
		e.display='none';
		}
	else {
		e.display='block';
		}
	swapIcon('ti_'+b);
	}

function swapIcon(i) {
	objImg = document.getElementById(i);
	if(objImg.src.indexOf(closeImg)>-1) {
		objImg.src = openImg;
		}
	else {
		objImg.src = closeImg;
		}
	}