var reg = new RegExp("^(.*?)_");
	function high(who)
	{
		var prefix = reg.exec( who.id )[1];
		document.getElementById(prefix + "_top").style.backgroundColor = "#C32828";
		document.getElementById(prefix + "_mid").style.backgroundColor = "#5C5C5C";		
	}// end high(who)
	
	function low(who)
	{
		var prefix = reg.exec( who.id )[1];
		document.getElementById(prefix + "_top").style.backgroundColor = "#5C5C5C";
		document.getElementById(prefix + "_mid").style.backgroundColor = "#999A9C";
	}// end low(who)