function swapimg(id,img) {	$(id).src = img; }

var billboards= new Array('billboard0', 'billboard1', 'billboard2', 'billboard3', 'billboard4', 'billboard5', 'billboard6','billboard7');
var sm_billboards= new Array('sm_billboard0', 'sm_billboard1', 'sm_billboard2', 'sm_billboard3', 'sm_billboard4');
var billidx = 0; 
var sm_billidx = 0; 
var homeimage_interval = 5500;

function homeimage_change()
{
	Effect.Fade(billboards[billidx], { duration:2.5, from:1.0, to:0.0 });
	billidx++;
	if (billidx == billboards.length) {
		billidx = 0;
	}

	//alert('i='+i + ' ' + billboards[i]);
	Effect.Appear(billboards[billidx], { duration:2.5, from:0.0, to:1.0 });
	
	/*
	Effect.Fade(sm_billboards[sm_billidx], { duration:2.5, from:1.0, to:0.0 });
	sm_billidx++;
	if (sm_billidx == sm_billboards.length) {
		sm_billidx = 0;
	}
	
	//alert('i='+i + ' ' + billboards[i]);
	Effect.Appear(sm_billboards[sm_billidx], { duration:2.5, from:0.0, to:1.0 });
	*/
}

function homepage_init() {	setTimeout( 'homeimage_change();start_homeimages();', 3000); }
function start_homeimages() { setInterval('homeimage_change()',homeimage_interval); }

function highlightNav (pageId) {
	var imgName = '';
	switch (pageId) {
		case "nav-who-we-are": imgName = 'images/nav/over/who-we-are.gif'; break;
		case "nav-what-we-do": imgName = 'images/nav/over/what-we-do.gif'; break;
		case "nav-why-were-here": imgName = 'images/nav/over/why-were-here.gif'; break;
		case "nav-calendar": imgName = 'images/nav/over/calendar.gif'; break;
		case "nav-news": imgName = 'images/nav/over/news.gif'; break;
		case "nav-how-you-can-help": imgName = 'images/nav/over/how-help.gif'; break;
		case "nav-donate": imgName = 'images/nav/over/donate.gif'; break;
		case "nav-email-signup": imgName = 'images/nav/over/email-signup.gif'; break;
		case "nav-space-rental": imgName = 'images/nav/over/space-rental.gif'; break;
		case "nav-espanol": imgName = 'images/nav/over/espanol.gif'; break;
		case "nav-contact": imgName = 'images/nav/over/contact.gif'; break;
	}

	var img = document.getElementById(pageId);
	img.src = imgName;
	img.onmouseover = null;
	img.onmouseout = null;
}