function getE(name)

{

	if (document.getElementById)

		var elem = document.getElementById(name);

	else if (document.all)

		var elem = document.all[name];

	else if (document.layers)

		var elem = document.layers[name];

	return elem;

}



function toggleLayer(whichLayer, flag)

{

	var style = getE(whichLayer).style;

	style.display = (flag == '') ? 'none' : 'block';

}



function openCloseLayer(whichLayer, action)

{

 	var style = getE(whichLayer).style;

	if (!action)

		style.display = style.display == 'none' ? 'block' : 'none';

	else if (action == 'open')

		style.display = 'block';

	else if (action == 'close')

		style.display = 'none';

}