function expand(category)
{
	elem = document.getElementById(category + '_div');

	if ( elem.style.display == 'block' )
	{
		elem.style.display='none;'
	}
	else
	{
		elem.style.display='block';
	}
}

function swapsymbol(category)
{

	elem = document.getElementById(category + '_link');

	if ( elem.innerHTML == '[+]' )
	{
		elem.innerHTML = '[-]';
	}
	else
	{
		elem.innerHTML = '[+]';
	}
}