function toggleExpand(theSpan, theDiv)
{
	theSpan.innerHTML = '[-]';
	theSpan.onclick = function() { toggleCollapse(theSpan, theDiv); }
	theDiv.style.display = 'block';
}

function toggleCollapse(theSpan, theDiv)
{
	theSpan.innerHTML = '[+]';
	theSpan.onclick = function() { toggleExpand(theSpan, theDiv); }
	theDiv.style.display = 'none';
}

function collapseAll()
{
	
	span_ar = $$('.expand');
	div_ar = $$('.answer');
	for(var i in span_ar) {
		if(!isNaN(i)) {
			toggleCollapse(span_ar[i], div_ar[i]);
		}
	}
}

function expandAll()
{

	span_ar = $$('.expand');
	div_ar = $$('.answer');
	for(var i in span_ar) {
		if(!isNaN(i)) {
			toggleExpand(span_ar[i], div_ar[i]);
		}
	}
}