var base = '/fileadmin/images/regionen/';

/** caching pictures */
IM01 = new Image();
IM01.src = base + 'map_az.jpg';

IM02 = new Image();
IM02.src = base + 'map_bz.jpg';

IM03 = new Image();
IM03.src = base + 'map_ot.jpg';

IM04 = new Image();
IM04.src = base + 'map_sz.jpg';

IM05 = new Image();
IM05.src = base + 'map_zt.jpg';


function changeImage(name)
{	
	
	var current = $('column-right').getElementsByTagName('img')[0];
	
	var replacement = document.createElement('img');
		replacement.src = base + name;
		replacement.useMap = current.useMap;
	
	
	current.replace(replacement);
}