/*
   New Perspectives on JavaScript
   Tutorial 5
   Tutorial Case

   Filename: scripts.js

   Functions List:
   hideIt(object)
      Hides an object
   showIt(object)
      Unhides an object

*/
var ActiveMenu = null;
	
	function hideActive() {
	if (ActiveMenu !== null) {
			hideIt(ActiveMenu);
			ActiveMenu = null;
		}
	}
	function popMenu(M) {
		hideActive();
		ActiveMenu = document.getElementById(M);
		showIt(ActiveMenu);
		}

function hideIt(object) {
   object.style.visibility="hidden";
}

function showIt(object) {
   object.style.visibility="visible";
}