function rollout(objMenuitem, objEvent)
				{
					var iKeyCode;

					// Check if from a keyboard - non IE, but
					// irrelevant as tab doesn't trigger the 
					// keypress event in IE
					if (objEvent && objEvent.type == 'keypress')
					{
						if (objEvent.keyCode)
							iKeyCode = objEvent.keyCode;
						else if (objEvent.which)
							iKeyCode = objEvent.which;

						// If it's not the enter key or space key, 
						// pass control back to the browser
						if (iKeyCode != 13 && iKeyCode != 32)
							return true;
					}

					// Work out what we need to do
					if (objMenuitem.nextSibling.style.display == 'block')
						var strDisplay = 'none'
					else
						var strDisplay = 'block';

					// Close any nested lists that are open
					var objMenu = document.getElementById('mainnav');
					var objNested = objMenu.getElementsByTagName('ul');

					for (var i=0; i<objNested.length; i++)
						if (objNested[i].style.display == 'block')
							objNested[i].style.display = 'none';

					objMenuitem.nextSibling.style.display = strDisplay;
				    
					// Keep any parent menus for this item open
					while (objMenuitem.parentNode.parentNode.id != 'mainnav')
					{
						objMenuitem = objMenuitem.parentNode.parentNode;
						objMenuitem.style.display = 'block';
					}

					// Stop the browser requesting the link
					return false;
				}

				function rollup()
				{
					var bRollup, objLinks, objNode, objAnchor;

					// Check we're working with a DOM compliant browser
					if (document.getElementById && document.createElement)
					{
						var strLocation = window.location;

						var objMenu = document.getElementById('mainnav');

						var objNested = objMenu.getElementsByTagName('ul');

						// Hide each of the nested unordered list
						for (var i=0; i<objNested.length; i++)
						{
							// Only hide, if the current location is not found in the list
							bRollup = true;
							objLinks = objNested[i].getElementsByTagName('a');

							for (var j=0; j<objLinks.length; j++)
							{
								if (objLinks[j].href == strLocation)
								{
									bRollup = false;

									// Added by John Hunter
									// remove link for current page
									objNode = objLinks[j];
									strContent = objNode.firstChild.data;
									var objCurrentPage = document.createElement('strong');
									objCurrentPage.appendChild(document.createTextNode(strContent));
									objNode.parentNode.replaceChild(objCurrentPage, objNode);

									// Add an id so we can keep the parents open
									objCurrentPage.id = 'jsKeepOpen';
								}

							}

							if (bRollup == true)
								objNested[i].style.display = 'none';
							else
								objNested[i].style.display = 'block';

							// Place the top-level text in an anchor tag
							objNode = objNested[i].parentNode;

							strContent = objNode.firstChild.data;

							objAnchor = document.createElement('a');
							objAnchor.href = '#';
							objAnchor.onclick = function(event){return rollout(this, event);}
							objAnchor.onkeypress = function(event){return rollout(this, event);}
							objAnchor.appendChild(document.createTextNode(strContent));

							objNode.replaceChild(objAnchor, objNode.firstChild);
						}

						// Keep any parent menus for the current item
						if (document.getElementById('jsKeepOpen'))
						{
							var objKeepOpen = document.getElementById('jsKeepOpen');
							while (objKeepOpen.parentNode.id != 'mainnav')
							{
								objKeepOpen = objKeepOpen.parentNode;
								objKeepOpen.style.display = 'block';
							}
						}
					}
				}