function showUnit(unit){
	var hide = 'imperial';
	var show = 'metric';
	
	if(unit == 'imperial'){
		var hide = 'metric';
		var show = 'imperial';
	}

	var divShowNodes = getElementsByClass(show,null,'span')

	for (var j = 0; j < divShowNodes.length; j++){
		divShowNodes[j].style.display = 'inline';	
	} 
	
	var divHideNodes = getElementsByClass(hide,null,'span')

	for (var j = 0; j < divHideNodes.length; j++){
		divHideNodes[j].style.display = 'none';	
	} 

	return false;
}