var count = new Array(); count[0] = 1;
count[1] = 7;
function showhide(level,counter)
{
	if (counter > 0) div = document.getElementById('nav_'+level+'_'+counter)
	for(i = 1; i <= count[level]; i++)	{
		if (counter != i) document.getElementById('nav_'+level+'_'+i).style.display = 'none';
		}
	if (counter > 0)
	div.style.display = (div.style.display == '') ? 'none' : '';
}