var initState;

function loadContent(url)
{
	// blank it out
	var contentDiv = document.getElementById('mainContent');
	contentDiv.innerHTML = '<center><img id="loader" src="ajax-loader.gif"></center>';
	
	ajaxFetch( url, updateContent );
}

function updateContent(content)
{
	var contentDiv = document.getElementById('mainContent');
	contentDiv.innerHTML = content;
}

function saveState()
{
  initState = document.getElementById('mainContent').innerHTML;
}

function restoreState()
{
  document.getElementById('mainContent').innerHTML = initState;
}