/*****
Image Cross Fade Redux
Version 1.0
Last revision: 02.15.2006
steve@slayeroffice.com

Please leave this notice intact. 

Rewrite of old code found here: http://slayeroffice.com/code/imageCrossFade/index.html

Slightly modified by mach @ mach01.com
*****/

var IE5 = false;
var so_xfade_interval = 4000;

if(navigator.appVersion.indexOf("MSIE") != -1) 
{
	var temp = navigator.appVersion.split("MSIE");
	var version = parseFloat(temp[1]);
	IE5 = (version<=5.5);
}

window.addEventListener?window.addEventListener("load",so_init,false):window.attachEvent("onload",so_init);
var d=document, imgs = new Array(), zInterval = null, current=0, pause=false;

function so_init() {
	if(!d.getElementById || !d.createElement)return;
	
	imgs = d.getElementById("slideshow").getElementsByTagName("img");
	for(i=0;i<imgs.length;i++) { 
		imgs[i].xOpacity = 0; 
		imgs[i].style.visibility = "hidden"; 
		setOpacity(imgs[i]);
	}
	
	// pick a random start image
	current = Math.floor(Math.random()*(imgs.length));
	imgs[current].xOpacity = .99;
	setOpacity(imgs[current]);
	
	imgs[current].style.visibility = "visible";
	
	if(IE5) setTimeout(so_xfade_ie55, so_xfade_interval);
	else setTimeout(so_xfade,so_xfade_interval);
}

function so_xfade_ie55() 
{
	nIndex = imgs[current+1]?current+1:0;
	imgs[nIndex].style.visibility = "visible";
	imgs[current].style.visibility = "hidden";
	current = nIndex;
	setTimeout(so_xfade_ie55,so_xfade_interval);
}

function so_xfade() {
	cOpacity = imgs[current].xOpacity;
	nIndex = imgs[current+1]?current+1:0;
	nOpacity = imgs[nIndex].xOpacity;
	cOpacity-=.05; 
	nOpacity+=.05;
	imgs[nIndex].style.visibility = "visible";
	imgs[current].xOpacity = cOpacity;
	imgs[nIndex].xOpacity = nOpacity;
	setOpacity(imgs[current]); 
	setOpacity(imgs[nIndex]);
	if(cOpacity<=0) {
		imgs[current].style.visibility = "hidden";
		current = nIndex;
		setTimeout(so_xfade,so_xfade_interval);
	} else {
		setTimeout(so_xfade,50);
	}
}

function setOpacity(obj) {
	if(obj.xOpacity>.99) {
		obj.xOpacity = .99;
		return;
	}
	obj.style.opacity = obj.xOpacity;
	obj.style.MozOpacity = obj.xOpacity;
	obj.style.filter = "alpha(opacity=" + (obj.xOpacity*100) + ")";
}