function showLayer(lyr) 
{
   document.getElementById(lyr).style.visibility = 'visible';
   document.getElementById(lyr).style.display = 'block';
}

function hideLayer(lyr) 
{
   document.getElementById(lyr).style.visibility = 'hidden';
   document.getElementById(lyr).style.display = 'none';
}

function toggle(lyr, arr)
{
	for(var i=0; i<arr.length; i++)
	{
		if (arr[i] && arr[i] == lyr) {
             		showLayer(lyr);
		} else if (arr[i] && arr[i] != "") {
			hideLayer(arr[i]);
		}
	}
}