function showImg(id)
{
	var elems = document.getElementsByTagName("*");
	
	for (var cls, i = 0; (elem = elems[i]); i++)
	{
		if (elem.className == 'imgGalerieGross')
		{
			elem.style.display='none';
		}
		if (elem.className == 'imgGalerieKlein')
		{
			elem.style.border='1px solid white';
		}
	}
	
	document.getElementById('img_' + id).style.display='block';
	document.getElementById('thumb_' + id).style.border='1px solid black';
}