var lastSubOpen = 0;

function viewSubmenue(subID)
{
	if(document.getElementById('sub'+lastSubOpen) != null)
	{
		document.getElementById('sub'+lastSubOpen).style.display = 'none';
		lastSubOpen = 0;
	}
	if(document.getElementById('sub'+subID) != null)
	{
		document.getElementById('sub'+subID).style.display = 'inline';
		lastSubOpen = subID;
	}
}