function showHide(id) {
	var el = $(id);
	if(el.style.display=='none') {
		el.style.display = 'block';
	}else if(el.style.display=='block') {
		el.style.display = 'none';
	}else {
		el.style.display = 'block';
	}
}

function hideImages() {
	var imgs = $('gallery_images').getElementsByTagName('img');
	for(i=0; i<imgs.length; i++) {
		imgs[i].style.display='none';
	}
	var a = $('gallery_nav').getElementsByTagName('a');
	for(i=0; i<a.length; i++) {
		a[i].className='';
	}
}
function showImage(id, obj) {
	hideImages();
	$('img_'+id).style.display='inline';
	obj.className = 'active';
}