var previousMenu;

// Drop down menu
function mouseEnter()
{
	if (previousMenu != null)
	{
		document.getElementById(previousMenu).style.display = 'none';		
	}
}

// Drop down menu
function mouseEntered(menu)
{
	if (document.getElementById(menu).style.display == 'none')
	{
		if (previousMenu != null)
		{
			document.getElementById(previousMenu).style.display = 'none';
		}
		document.getElementById(menu).style.display = '';
		previousMenu = menu;
	}	
}


function mouseLeft(menu)
{		
	if (document.getElementById(menu).style.display == '')
	{
		document.getElementById(menu).style.display = 'none';							
	}
	else
	{
		document.getElementById(menu).style.display = '';
		previousMenu = menu;
	}
}