function toggle(category) {
	var node = document.getElementById(category);
	var subnode = document.getElementById(category + "sub");
	
	if ( node.style.listStyleImage.match(/down/) ) {
		node.style.listStyleImage="url(/images/triangle_orange.gif)";
		
		subnode.style.display = "none";
		
		return;
	}
	
	else {
		node.style.listStyleImage="url(/images/triangle_down.gif)";
		
		subnode.style.display = "block";
		
		return;
	}
}