/* Acknowledgement: this is based on the Wikipedia table-of-contents * toggle. */ var idCounter = 0; function showTreeToggle(isHidden) { if (document.getElementById) { var id = "toggle_" + idCounter; document.writeln( '<a href="javascript:toggleTree(\'' + id + '\')" class="toggle" id="' + id + '">' + '<span class="showTree" ' + (isHidden ? '' : 'style="display: none;"') + '>+</span>' + '<span class="hideTree" ' + (isHidden ? 'style="display: none;"' : '') + '>-</span>' + '</a>'); idCounter = idCounter + 1; } } function toggleTree(id) { var href = document.getElementById(id); var node = href; var tree = null; while (node != null) { if (node.className == "nesting") tree = node; node = node.nextSibling; } node = href.firstChild; var hideTree = null; var showTree = null; while (node != null) { if (node.className == "showTree") showTree = node; else if (node.className == "hideTree") hideTree = node; node = node.nextSibling; } if (tree.style.display == 'none') { tree.style.display = ''; hideTree.style.display = ''; showTree.style.display = 'none'; } else { tree.style.display = 'none'; hideTree.style.display = 'none'; showTree.style.display = ''; } }