function toggleLayer(str)
{
	if(document.getElementById(str).style.visibility == "hidden" || document.getElementById(str).style.display == "none")
	{
		var style2= document.getElementById(str).style;
		style2.display="block";
		style2.visibility="visible";
	}
	else
	{
		var whichLayer=str;
		var style2 = document.getElementById(whichLayer).style;
		style2.display="none";
		style2.visibility="hidden";
	}
}

function hideLayer(str)
{
	var whichLayer=str;
	var style2 = document.getElementById(whichLayer).style;
	style2.display="none";
	style2.visibility="hidden";
}

function showLayer(str)
{
	var style2= document.getElementById(str).style;
	style2.display="block";
	style2.visibility="visible";
}