function toggle(id, imgobj)
{
	var obj = document.getElementById("branch_" + id);
	obj.className = (obj.className == 'branch_hidden') ? 'branch' : 'branch_hidden';
	var path = imgobj.src.split("/");
	var filename = path.pop();
	path = path.join("/") + "/";
	imgobj.src = path + ((filename == 'expand.gif') ? 'collapse.gif' : 'expand.gif');
}