var openImg = new Image();
	openImg.src = "http://www.bvkb.be/BVKB/logo/open.gif";
	var closedImg = new Image();
	closedImg.src = "http://www.bvkb.be/BVKB/logo/closed.gif";

	function showBranch(branch){
		var objBranch = document.getElementById(branch).style;
		if(objBranch.display=="block")
			objBranch.display="none";
		else
			objBranch.display="block";
	}

	function swapFolder(img){
		objImg = document.getElementById(img);
		if(objImg.src.indexOf('closed.gif')>-1)
			objImg.src = openImg.src;
		else
			objImg.src = closedImg.src;
	}