function expandMenu(menuItem)
{
	hideDiv(menuItem + 'Top')
	showDiv(menuItem + 'Expanded')
} 

function collapseMenu(menuItem)
{
	hideDiv(menuItem + 'Expanded')
	showDiv(menuItem + 'Top')
}

function setDivVis(divId, disp)
{
	var div = document.getElementById(divId);
	if (div)
	{
		var style = div.style; 
		if (style)
		{
			style.display = disp;
		}
	}
}

function showDiv(divId)
{
	setDivVis(divId, 'block');
}
function hideDiv(divId)
{
	setDivVis(divId, 'none');
}