function show_hide (x) {
	a=1;
	while(window.document.getElementById('menu_'+a)) {
			window.document.getElementById('menu_'+a).style.display='none';
		a++;
	}
	window.document.getElementById(x).style.display='block';
}

function swap_image(did,pid,item) {
	foto.src="produkty/"+did+"/"+pid+"/srn/"+item;
	
	x=window.document.getElementById('odnosnik');
	x.href='produkty/'+did+'/'+pid+'/big/'+item;
}