//
// Global Variables
//

var previousMenuItem = "Introduction";



//
// Top Menu Functions
//

function showTopSubmenu (menuItem) {
	var topMenuItem = document.getElementById (menuItem + "TopMenu");
	var topSubmenuItem = document.getElementById (menuItem + "TopSubmenu");
	var prevTopMenuItem = document.getElementById (previousMenuItem + "TopMenu");
	var prevTopSubmenuItem = document.getElementById (previousMenuItem + "TopSubmenu");

	previousMenuItem = menuItem;

	prevTopMenuItem.style.backgroundColor = "#000000";
	topMenuItem.style.backgroundColor = "#115AAD";

	prevTopSubmenuItem.style.display = "none";
	topSubmenuItem.style.display = "block";
} // end showTopSubmenu function



//
// Main Content Functions
//

function goBackOnePage () {
	window.history.back ();
} // end goBackOnePage function