/*****

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, 
    img1 = new Array(), 
    img2 = new Array(), 
    img3 = new Array(), 
    img4 = new Array(), 
    imgs = new Array(), 
    zInterval = null, 
    current=0, 
    nIndex=4, 
    pause=false;

function so_init() {
	if(!d.getElementById || !d.createElement)return;
	
    var index;

	css = d.createElement("link");
	css.setAttribute("href","/media/xfade2_0.css");
	css.setAttribute("rel","stylesheet");
	css.setAttribute("type","text/css");
	d.getElementsByTagName("head")[0].appendChild(css);
	
	imgs = d.getElementById("slideshowimages").getElementsByTagName("img");

    /* Initialize all images as invisible (opacity = 0) */
	for(i=1;i<imgs.length;i++) { 
        imgs[i].xOpacity = 0;
    }

    /* Set up the individual positions */
	for(i=0;i<imgs.length;i++) { 
        index = i % 4;
        /* Position each image in one of four positions */
        imgs[i].style.left = index * 160;
    }

	imgs[0].style.display = "block";
	imgs[0].xOpacity = .99;
	imgs[1].style.display = "block";
	imgs[1].xOpacity = .99;
	imgs[2].style.display = "block";
	imgs[2].xOpacity = .99;
	imgs[3].style.display = "block";
	imgs[3].xOpacity = .99;
	
	setTimeout(so_xfade,2000);
}

function so_xfade() {

	cOpacity = imgs[current].xOpacity;

	/* nIndex = imgs[current+4]?current+4:imgs.length-(current-1); */
    

	nOpacity = imgs[nIndex].xOpacity;
	
	cOpacity-=.05;  
	nOpacity+=.05;
	
	imgs[nIndex].style.display = "block";
	imgs[current].xOpacity = cOpacity;
	imgs[nIndex].xOpacity = nOpacity;
	
	setOpacity(imgs[current]); 
	setOpacity(imgs[nIndex]);
	
	if(cOpacity<=0) {
		imgs[current].style.display = "none";
		current = current + 1;
        if(current >= imgs.length) {
            current = 0;
        }
        /* Next image (or first image) index */
        if(imgs[current+4]) {
            nIndex = current + 4;
        }
        else {
            nIndex = current + 4 - imgs.length;
        }

		setTimeout(so_xfade,2000);
	} 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) + ")";
	}
	
}