function subMenuOn(menuName)
{
	document.getElementById(menuName).className='subMenuOn';
}

function subMenuOff(menuName)
{
	document.getElementById(menuName).className='subMenuOff';
}

function allOff()
{
	document.getElementById('sellingSubMenu').className='subMenuOff';
	document.getElementById('buyingSubMenu').className='subMenuOff';
}