function navchange(id)
{
	//Unternavigation einblenden
	elements = document.getElementById('bottomnav').getElementsByTagName('div');
	anz = elements.length;
	
	for(i=0; i < anz; i++)
	{
		elements.item(i).style.display = 'none';
	}
	
	elements.item(id - 1).style.display = 'block';
	
	
	//Farbe der oberen Navigation anpassen
	elements = document.getElementById('topnav').getElementsByTagName('div');
	anz = elements.length;
	
	for(i=0; i < anz; i++)
	{
		elements.item(i).style.backgroundColor = 'transparent';
		elements.item(i).style.color = '#E8E8D8';
		
		if(i != anz-1)
		{
		  elements.item(i).style.backgroundImage = 'url(images/layout/navspacer.gif)';
		}
	}
	
	elements.item(id - 1).style.backgroundColor = '#E8E8D8';
	elements.item(id - 1).style.color = '#7AAC27';
	elements.item(id - 1).style.backgroundImage = 'url()';
}