function navover(id) {
	$('#'+id).attr('src','/images/nav/over/' + id.replace('nav_','') + '.gif');
}
function navout(id, isOn) {
	if( isOn > 0 )
		$('#'+id).attr('src', '/images/nav/over/' + id.replace('nav_','') + '.gif');
	else
		$('#'+id).attr('src', '/images/nav/' + id.replace('nav_','') + '.gif');
}