function ToggleTableOfContents(_subject)
{
	var toc = document.getElementById('TableOfContents');
	if(toc.innerHTML == '')
	{
		var loc = document.location.toString().replace('http://');
		var a_loc = loc.split('/');
		a_loc.shift();
		loc = a_loc.join('/');
		var url = '/_nv/drill/toc/'+_subject+'?u='+loc;
		var xhr = new Ajax(url, {
			onComplete: TableOfContents_Response,
			method: 'get'
		}).request();
	}
	else if(toc.style.display == 'none' && toc.innerHTML != '')
		toc.style.display = 'block';
	else
		toc.style.display = 'none';
}

function TableOfContents_Response(_response)
{
	if(_response != '')
	{
		document.getElementById('TableOfContents').innerHTML = _response;
		document.getElementById('TableOfContents').style.display = 'block';
	}
}