//function for dropdown menu

function dropDown(menuId, isOverSub)
{
	var className = document.getElementById(menuId).className;
	
	if (className == 'over')
	{
		if (!isOverSub)
		{
			document.getElementById(menuId).className = '';
		}
	}
	
	else if (className == 'has_sub over')
	{
		if (!isOverSub)
		{
			document.getElementById(menuId).className = 'has_sub';
		}
	}
	
	else if (className == 'first has_sub over')
	{
		if (!isOverSub)
		{
			document.getElementById(menuId).className = 'first has_sub';
		}
	}
	
	else if (document.getElementById(menuId).className == '')
	{
		document.getElementById(menuId).className = 'over';
	}
	
	else if (document.getElementById(menuId).className == 'has_sub')
	{
		document.getElementById(menuId).className = 'has_sub over';
	}
	
	else if (document.getElementById(menuId).className == 'first has_sub')
	{
		document.getElementById(menuId).className = 'first has_sub over';
	}
}