function show_hide_div(div_id){
	var div_foto = document.getElementById(div_id);
	if((div_foto.style.display == 'none') || (div_foto.style.display === '')){
		div_foto.style.display = 'block';
	}
	else{
		div_foto.style.display = 'none';
	}
}

function swap_img_list(list_id){
	var list_div = document.getElementById('list_div_' + list_id);
	var list_img = document.getElementById('list_img_' + list_id);
	// visualizza/nascondi div
	if((list_div.style.display == 'none') || (list_div.style.display === '')){
		list_div.style.display = 'block';
		list_img.src = '/images/arrow_d.gif';
	}
	else{
		list_div.style.display = 'none';
		list_img.src = '/images/arrow_r.gif';
	}
}

function article_slide(element_id, position, direction){
	var current_article = document.getElementById(element_id+position);
	if(direction == 'next') position++;
	else position--;
	var next_article = document.getElementById(element_id+position);
	if((current_article!=null) && (next_article!=null)){
		current_article.style.display = 'none';
		next_article.style.display = '';
	}
}

/*
function articolo_list(list_id, list_div, list_li){
	var div_articolo = document.getElementById('articolo_gruppo_' + list_id);
	var li_articolo = document.getElementById('articolo_gruppo_list_' + list_id);
	// visualizza/nascondi div
	if((div_articolo.style.display == 'none') || (div_articolo.style.display == '')){
		div_articolo.style.display = 'block';
		li_articolo.src = '/images/arrow_d.gif'
	}
	else{
		div_articolo.style.display = 'none';
		li_articolo.src = '/images/arrow_r.gif'
	}
	// aggiorna list style
	//alert(li_articolo.src);
//	if((div_articolo.style.display == 'none') || (div_articolo.style.display == '')) div_articolo.style.display = 'block';
//	else div_articolo.style.display = 'none';
	
}*/