//Show the Elements in the array obj
function show(obj){ 
	list = obj.split(",");
	for(i in list){ 
		document.getElementById(list[i]).style.display = 'block';
	} 
}

//Hide the Elements in array obj
function hide(obj){
	list = obj.split(",");
	for(i in list){
		//The display style when set to 'none' makes the object invisible.
			document.getElementById(list[i]).style.display = 'none';
	}
}