/*****

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


*****/


window.addEventListener?window.addEventListener("load",so_init,false):window.attachEvent("onload",so_init);

var d=document, imgs = new Array(), legends = new Array(), zInterval = null, current=0, pause=false;

function so_init() {
	if(!d.getElementById || !d.createElement)return;
	// hide image DIV
	document.getElementById("imageContainer").style.display = 'none';
	document.getElementById("LegendBox").style.display = 'none';
	
	css = d.createElement("link");
	css.setAttribute("href","xfade2.css");
	css.setAttribute("rel","stylesheet");
	css.setAttribute("type","text/css");
	d.getElementsByTagName("head")[0].appendChild(css);
	// identify & setup all images
	imgs = d.getElementById("imageContainer").getElementsByTagName("img");
	for(i=1;i<imgs.length;i++) imgs[i].xOpacity = 0;
	imgs[0].style.display = "block";
	imgs[0].xOpacity = .99;
	// now for legend box
	legends = d.getElementById("LegendBox").getElementsByTagName("img");
	for(i=1;i<legends.length;i++) legends[i].xOpacity = 0;
	legends[0].style.display = "block";
	legends[0].xOpacity = .99;
	
	// now display div.
	document.getElementById("imageContainer").style.display = 'block';
	document.getElementById("LegendBox").style.display = 'block';
}

function so_xfade() {
	cOpacity = imgs[current].xOpacity;
	// nIndex = imgs[current+1]?current+1:0;  this is now provided by radio button
	nOpacity = imgs[nIndex].xOpacity;
	
	cOpacity-=.10; 
	nOpacity+=.10;
	
	imgs[nIndex].style.display = "block";
	imgs[current].xOpacity = cOpacity;
	imgs[nIndex].xOpacity = nOpacity;
	// same for legend
	legends[nIndex].style.display = "block";
	legends[current].xOpacity = cOpacity;
	legends[nIndex].xOpacity = nOpacity;
	
	setOpacity(imgs[current]); 
	setOpacity(imgs[nIndex]);
	setOpacity(legends[current]); 
	setOpacity(legends[nIndex]);
	
	
	if(cOpacity<=0) {
		imgs[current].style.display = "none";
		legends[current].style.display = "none";
		current = nIndex;
		// setTimeout(so_xfade,5000);   was 1000 :  don't loop around - wait for radio button event.
	} else {
		setTimeout(so_xfade,50);  /* loop for fading effect */
	}
	
	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) + ")";
	}
	
}