function obj(menu){
	return (navigator.appName == "Microsoft Internet Explorer")?this[menu]:document.getElementById(menu);
}
function toggle(treepart){
	if (this.obj("T"+treepart).style.visibility == "hidden"){
		this.obj("T"+treepart).style.position="";
		this.obj("T"+treepart).style.visibility="";
		document["I"+treepart].src="images/minus.png";
	}else{
		this.obj("T"+treepart).style.position="absolute";
		this.obj("T"+treepart).style.visibility="hidden";
		document["I"+treepart].src="images/plus.png";
	}
}