var LAYERSET_JS = true;
var LAYERSET_TYPE_MEM = new Array();
var LAYERSET_DEFAULT_DISPLAY = 'block';

// Easily create and work with a "Layerset" array of all the DIV children of an object
// For best results, uses getelement.js

function ls_hide_func(element)
{
	// To allow easy switching of the method
	element.style.visibility = 'hidden';
}

function ls_show_func(element)
{
	// To allow easy switching of the method
	element.style.visibility = 'visible';
}

function ls_collapse_func(element)
{
	element.style.display = 'none';
}

function ls_uncollapse_func(element)
{
	element.style.display = LAYERSET_TYPE_MEM[element.id];
}



function layerset(root, tag, restore_to)
{
	root = (typeof(root) == 'string') ? document.getElementById(root) : root;
	if (!tag) { tag="div"; } // default

	elements = root.getElementsByTagName(tag);
	
	for (i=0; i<elements.length; i++) {
		var restore;
		
		if (elements[i].style.display) {
			restore = elements[i].style.display;
		}
		else {
			restore = restore_to ? restore_to : LAYERSET_DEFAULT_DISPLAY;
		}
		
		LAYERSET_TYPE_MEM[elements[i].id] = restore;
	}
	
	return elements;
}

function hide_all(set)
{
	var i;
	for (i=0; i<set.length; i++) {
		ls_hide_func(set[i]);
	}
}

function collapse_all(set)
{
	var i;
	for (i=0; i<set.length; i++) {
		ls_collapse_func(set[i]);
	}
}

function show_only(set, id)
{
	var i;
	for (i=0; i<set.length; i++) {
		if (set[i].id != id) {
			ls_hide_func(set[i]);
		}
		else {
			ls_show_func(set[i]);
		}
	}
}

function uncollapse_only(set, id)
{
	var i;
	for (i=0; i<set.length; i++) {
		if (set[i].id != id) {
			ls_collapse_func(set[i]);
		}
		else {
			ls_uncollapse_func(set[i]);
		}
	}
}