var prefix = 'images/';

if (prefix==null || prefix=='') {
	var prefix = "images/";
}

var tree_open = new Image();
tree_open.src = prefix + 'tree_open.gif';

var tree_closed = new Image();
tree_closed.src = prefix + 'tree_closed.gif';

function toggle_tree(id) {
	element = document.getElementById(id);
//	img = document.getElementById('i'+id);
	if (!element) return;

	if (element.className == 'div_tree') {
		element.className = 'div_tree_closed'
//		if(img) {
//			img.src = tree_closed.src;
//		}
	}
	else {
		element.className = 'div_tree';
//		if(img) {
//			img.src = tree_open.src;
//		}
	}
	if(document.getElementById('l'+id)) {
		document.getElementById('l'+id).blur();
	}
}

function expand_b(start_id) {
	i = start_id;
	while (1) {

		element = document.getElementById(i);
//		img = document.getElementById('i'+ i);
		if (!element) break;
		
		element.className = 'div_tree'
//		if(img) {
//			img.src = tree_open.src;
//		}
		
		i++;
	}
}

function collapse_b(start_id) {
	i = start_id;
	while (1) {
	
		element = document.getElementById(i);
//		img = document.getElementById('i'+ i);
		if (!element) break;
		
		element.className = 'div_tree_closed'
//		if(img) {
//			img.src = tree_closed.src;
//		}
		
		i++;
	}
}