function expand(id)
{
	var list = document.getElementById(id);
	if (list.style.display != 'block')
	{
		document.getElementById('housing').style.display = 'none';
		document.getElementById('regeneration-development').style.display = 'none';
		list.style.display='block';
	}
	else
	{
		document.getElementById('housing').style.display = 'none';
		document.getElementById('regeneration-development').style.display = 'none';
	}
}