function popShow (layer) {
	var s = document.getElementById(layer);
	var a = document.getElementById('arrow_' + layer);
	s.style.visibility = 'visible';
	a.style.visibility = 'visible';
}

function popHide (layer) {
	var s = document.getElementById(layer);
	var a = document.getElementById('arrow_' + layer);
	s.style.visibility = 'hidden';
	a.style.visibility = 'hidden';
}

/* function moveArrow (layer,amount) {
	 var s = document.getElementById(layer);
	var a = document.getElementById('arrow_' + layer);

	var amount = amount * 20;
	
	var limit = 20 * 9;
	var records = 30;

	var move = a.style.top - amount - 1;

	a.style.top = move;

	if (amount >= limit) {
		// do something
		s.style.top =  amount + 'px';
	}

	alert(amount + ' | ' + limit); 
} */