/*
JAVASCRIPT FUNCTIONS FOR HOME PAGE ROTATING STORIES
-scott 3/20/07
*/
/*************************************************************************
  This code is from Dynamic Web Coding at http://www.dyn-web.com/
  Copyright 2001-3 by Sharon Paine 
  See Terms of Use at http://www.dyn-web.com/bus/terms.html
  regarding conditions under which you may use this code.
  This notice must be retained in the code as is!
*************************************************************************/
			
var isRotating = true;

var gnNumPodLayers = 3;

// onresize for ns4
var origWidth, origHeight;
if (document.layers) {
	origWidth = window.innerWidth; origHeight = window.innerHeight;
	window.onresize = function() { if (window.innerWidth != origWidth || window.innerHeight != origHeight) history.go(0); }
}

var cur_lyr = 1;	// holds id of currently visible layer
function swapLayers(id, nNumLayers) {
	if (nNumLayers != null) gnNumPodLayers = nNumLayers;
	if (cur_lyr != id) {
		hideLayer(cur_lyr);
		showLayer(id);
		cur_lyr = id;
	}
}

function showLayer(id) {
	var lyr = getElemRefs("lyr" + id);
	var btn = getElemRefs("podbutton" + id);
	if (lyr && lyr.css) {
		lyr.css.visibility = "visible";
		if (btn.className) btn.className = "buttonon";
		else if (btn.setAttribute) btn.setAttribute("class","buttonon");
	}
}

function hideLayer(id) {
	var lyr = getElemRefs("lyr" + id);
	var btn = getElemRefs("podbutton" + id);
	if (lyr && lyr.css) {
		lyr.css.visibility = "hidden";
		if (btn.className) btn.className = "button";
		else if (btn.setAttribute) btn.setAttribute("class","button");
	}
}

function getElemRefs(id) {
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? document.layers[id]: null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}

function initLayers(id) {
	if (cur_lyr) hideLayer(cur_lyr);
	showLayer(id);
	cur_lyr = id;
	thetimer = setTimeout("RotateLayer()",8000);
	index1 = 1;
}

function RotateLayer() {
	index1 = index1 + 1
	if (index1 == gnNumPodLayers+1) {
		index1 = 1;
	}
	swapLayers(index1 );
	thetimer = setTimeout("RotateLayer()",8000);
}

function StartRotation() {
	if (isRotating == false) {
		thetimer = setTimeout("RotateLayer()",8000);
		isRotating = true;
	}
}

function StopRotation() {
	isRotating = false;
	clearTimeout(thetimer);
}

function PrevRotation() {
	index1 = index1 - 1
	if (index1 == 0) {
		index1 = gnNumPodLayers;
	}
	swapLayers(index1);
}
			
function NextRotation() {
	index1 = index1 + 1
	if (index1 == gnNumPodLayers+1) {
		index1 = 1;
	}
	swapLayers(index1);
}