function showH(obj){
		document.getElementById('bl-'+obj).style.backgroundPosition='0px -34px';	
		document.getElementById('bc-'+obj).style.backgroundPosition='0px -34px';	
		document.getElementById('br-'+obj).style.backgroundPosition='0px -34px';	
	} 
	
	function showN(obj){
		document.getElementById('bl-'+obj).style.backgroundPosition='0px 0px';	
		document.getElementById('bc-'+obj).style.backgroundPosition='0px 0px';	
		document.getElementById('br-'+obj).style.backgroundPosition='0px 0px';	
	}