function ShowLayer(sId)
{
	var oLayer = document.getElementById(sId);
	oLayer.style.visibility = 'visible';
	oLayer.style.display    = 'block';
}

function HideLayer(sId)
{
	var oLayer = document.getElementById(sId);
	oLayer.style.visibility = 'hidden';
	oLayer.style.display    = 'none';
}

function HideShowLayer(sId)
{
	var oLayer = document.getElementById(sId);

	if(oLayer.style.visibility == 'hidden')
		ShowLayer(sId);
	else
		HideLayer(sId);
}

function ShowHide(sId) {	
	var oElement = window.document.getElementById(sId);
	oElement.style.display = oElement.style.display==''?'none':'';
}