// menu items

function Navigation() {									
	this.items = new Array();
}

function Item(id) {						
	this.id = id;
}

Navigation.prototype.addItem = function(id) {	// adds a resource 
	this.items[this.items.length] = new Item(id);
}

createHTML = function() {	
	// if (!NN4) nav.items = randomizeArray(nav.items);

	str = '';
	
	str += '<table border="0" cellpadding="0" cellspacing="0">';
	str += '<tr>';
	str += '<td><td><img src="../spacer.gif" width="10" height="5" border="0"></td></td>';

	
	for (var i=0; i<nav.items.length; i++) {
		str += '<td><a href="javascript:showMenu(\'' + nav.items[i].id + '\');" onMouseover="changeImage(\'' + nav.items[i].id + '\', \'\', \'' + nav.items[i].id + '\/menuitem_a.gif\');" onMouseout="changeImage(\'' + nav.items[i].id + '\', \'\', \'' + nav.items[i].id + '\/menuitem.gif\');">';
		str += '<img id="' + nav.items[i].id + '" name="' + nav.items[i].id + '" src="' + nav.items[i].id + '/menuitem.gif" border="0" alt=""></a></td>';
	}
	str += '</tr></table>';
	
	document.write(str);
}
	
Navigation.prototype.getIndex = function(item) {
	for (var i=0; i<this.items.length; i++) {
		if (item == this.items[i].id.toLowerCase()) return i;
	}
	return -1;
}

Navigation.prototype.showNext = function() {
	var current = this.getIndex(selectedItem.toLowerCase());
	var next = current + 1;
	if (next >= this.items.length) next = 0;
	top.location.href = '../' + this.items[next].id + '/index.html';
}

Navigation.prototype.showPrevious = function() {
	var current = this.getIndex(selectedItem.toLowerCase());
	var prev = current - 1;
	if (prev < 0) prev = this.items.length - 1;
	top.location.href = '../' + this.items[prev].id + '/index.html';
}