function set_display(id, count, act)
{
	var i, el, sid;
	
	if (count <= 0 || id == '') {
		return;
	}
		
	for (i = 0; i < count; i++)
	{
		sid = id + i.toString();
		el = document.getElementById(sid);
		if (el != null) {
			el.style.display = act;
		}		
	}
}