function showLayer(layerName)  {  
	document.getElementById(layerName).style.visibility='visible'; 
	}
	
function hideLayer(layerName)  {  
	document.getElementById(layerName).style.visibility='hidden';  
	}	
	
function newWindow(tc) {
		tcWindow = window.open(tc,'tcWin', 'width=500,height=650,scrollbars=no,background-color=#CCCCCC')
		tcWindow.focus()
	}