function changeNavImgOn(itemId, itemLanguage)
{
	elem = document.getElementById('topNav_' + itemId)
	elem.src = 'images/navbar_' + itemLanguage + '_' + itemId + '_on.gif'
}
function changeNavImgOut(itemId, itemLanguage)
{
	elem = document.getElementById('topNav_' + itemId)
	elem.src = 'images/navbar_' + itemLanguage + '_' + itemId + '_out.gif'
}