/*
 * Original from: http://brainerror.net/scripts/javascript/blendtrans/demo.html
 *
 * Edits by ASC:
 *   - Removed unnecessary OO code that caused MSIE to choke
 *   - Added pause between setting bg image and setting opacity to zero to
 *     prevent MSIE image flash
 *   - Increased opacity check argument to 103 for completely smooth fade
 *
 * Edits by Goat
 *  - Added functionality to suspend (pause) blending and restart, according to events fired by the user
 *  - Added functionality to change (select) the active image according to events fired by the user
 */

 
 var suspend = false;
 var newImage = null;

//find next image
function nextImage(o) {
    do o = o.nextSibling;
    while(o && o.tagName != 'IMG');
    return o;
}

//find first image inside an element
function firstChildImage(o) {
    
    o = o.firstChild;
        
    while(o && o.tagName != 'IMG') {
        o = o.nextSibling;
    }
    
    return o;
}

//set the opacity of an element to a specified value
function setOpacity(obj, o) {

    obj.style.opacity = (o / 100);
    obj.style.MozOpacity = (o / 100);
    obj.style.KhtmlOpacity = (o / 100);
    obj.style.filter = 'alpha(opacity=' + o + ')';
}

//make image invisible and set next one as current image
function getNextImage(image) {
	
    if (next = nextImage(image)) {
	image.style.display = 'none';
	image.style.zIndex = 0;

	next.style.display = 'block';
	next.style.zIndex = 100;

    } else {
	//if there is not a next image, get the first image again
	next = firstChildImage(image.parentNode);
    }

    if(newImage != null)
    {
        next = newImage;
        newImage = null;
    }

    return next;
}

//set default values for parameters and starting image
function blendImages(id, speed, pause, caption) {

    if(speed == null) {
        speed = 30;
    }
    
    if(pause == null) {
        pause = 1500;
    }

    var blend = document.getElementById(id);

    var image = firstChildImage(blend);

    startBlending(image, speed, pause, caption);
}

//make image a block-element and set the caption
function startBlending(image, speed, pause, caption) {

    image.style.display = 'block';

    if(caption != null) {
	document.getElementById(caption).innerHTML = image.alt;
    }

    if(!suspend || newImage != null)
    {
        continueFadeImage(image, 0, speed, pause, caption);
    }
    else
    {
        setTimeout(function() {startBlending(image, speed, pause, caption)}, 500);
    }
}

// ASC: copied from http://www.sean.co.uk/a/webdesign/javascriptdelay.shtm
function pausecomp(millis) {
    var date = new Date();
    var curDate = null;

    do { curDate = new Date(); }
    while(curDate-date < millis);
} 

//set an increased opacity and check if the image is done blending
function continueFadeImage(image, opacity, speed, pause, caption) {

    opacity = opacity + 3;

    if (opacity <= 103) 
    {

	    setTimeout(function() {fadeImage(image, opacity, speed, pause, caption)}, speed);

    } 
    else 
    {
	    /*var stripped = image.src.replace(/%20/i, " ");
	    var stripped = image.src.replace(/ /i, "%20");
	    var stripped = image.src.replace(/.jpg/i, "");
        var imgurl = "url('"+stripped+".jpg');"; // Hack Hack Hack OMG what is wrong with these browsers?
        */
        
        //alert("-" + imgurl + "-");
        /*if (1/*navigator.appVersion.indexOf("MSIE")!=-1*/ //) 
        /*{*/
            image.parentNode.style.backgroundImage = "url('"+image.src+"')";
            //alert(image.parentNode.style.backgroundImage);
        /*}*/
        /*else
        {*/
         /*   image.parentNode.style.backgroundImage = imgurl;
        }*/
        //alert("-" + imgurl + "-");
        
        //if the image is done, set it to the background and make it transparent
        

        // ASC: pause 1sec here to prevent MSIE image flash ...
        var paws=pause-1000;
        if (paws < 0 ) {
            paws = 0;
        }
        pausecomp(paws); //pausecomp(1000);

        setOpacity(image,0);
        //get the next image and start blending it again
        image = getNextImage(image);

	    setTimeout(function() {startBlending(image, speed, pause, caption)}, paws);		
    }
}

//set the opacity to a new value and continue the fading
function fadeImage(image, opacity, speed, pause, caption) {
    setOpacity(image,opacity);
    continueFadeImage(image, opacity, speed, pause, caption);
}

function setSuspend(value)
{
    suspend = value;
}

function setImage(id)
{
    newImage = document.getElementById(id);
    
}