var fadebgcolor = "#F7F7F7"

var fadearray = new Array() //array to cache fadeshow instances
var fadeclear = new Array() //array to cache corresponding clearinterval pointers

var dom = (document.getElementById) //modern dom browsers
var iebrowser = document.all

function fadeshow( billboard, fadewidth, fadeheight, borderwidth, delay, pause, displayorder )
{
    this.pausecheck = pause
    this.mouseovercheck = 0
    this.delay = delay
    this.degree = 10 //initial opacity degree (10%)
    this.curimageindex = 0
    this.nextimageindex = 1
    fadearray[fadearray.length] = this
    this.slideshowid = fadearray.length - 1
    this.canvasbase = "canvas" + this.slideshowid
    this.curcanvas = this.canvasbase + "_0"
    if( typeof displayorder != "undefined" )
        billboard.sort(function()
        {
            return 0.5 - Math.random();
        })
    this.billboard = billboard
    this.imageborder = parseInt(borderwidth)
    this.postimages = new Array() //preload images
    for( p = 0; p < billboard.length; p++ )
    {
        this.postimages[p] = new Image()
        this.postimages[p].src = billboard[p][0]
    }

    var fadewidth = fadewidth + this.imageborder * 2
    var fadeheight = fadeheight + this.imageborder * 2

    if( iebrowser && dom || dom ) //if IE5+ or modern browsers (ie: Firefox)
        document.write('<div id="master' + this.slideshowid + '" style="position:relative;width:' + fadewidth + 'px;height:' + fadeheight + 'px;overflow:hidden;"><div id="' + this.canvasbase + '_0" style="position:absolute;width:' + fadewidth + 'px;height:' + fadeheight + 'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;-khtml-opacity:10;background:' + fadebgcolor + '"></div><div id="' + this.canvasbase + '_1" style="position:absolute;width:' + fadewidth + 'px;height:' + fadeheight + 'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;background:' + fadebgcolor + '"></div></div>')
    else
        document.write('<div><img name="defaultslide' + this.slideshowid + '" src="' + this.postimages[0].src + '" /></div>')

    if( iebrowser && dom || dom ) //if IE5+ or modern browsers such as Firefox
        this.startit()
    else
    {
        this.curimageindex++
        setInterval("fadearray[" + this.slideshowid + "].rotateimage()", this.delay)
    }
}

function fadepic( obj )
{
    if( obj.degree < 100 )
    {
        obj.degree += 10
        if( obj.tempobj.filters && obj.tempobj.filters[0] )
        {
            if( typeof obj.tempobj.filters[0].opacity == "number" ) //if IE6+
                obj.tempobj.filters[0].opacity = obj.degree
            else //else if IE5.5-
                obj.tempobj.style.filter = "alpha(opacity=" + obj.degree + ")"
        }
        else if( obj.tempobj.style.MozOpacity )
            obj.tempobj.style.MozOpacity = obj.degree / 101
        else if( obj.tempobj.style.KhtmlOpacity )
            obj.tempobj.style.KhtmlOpacity = obj.degree / 100
    }
    else
    {
        clearInterval(fadeclear[obj.slideshowid])
        obj.nextcanvas = (obj.curcanvas == obj.canvasbase + "_0") ? obj.canvasbase + "_0" : obj.canvasbase + "_1"
        obj.tempobj = iebrowser ? iebrowser[obj.nextcanvas] : document.getElementById(obj.nextcanvas)
        obj.populateslide(obj.tempobj, obj.nextimageindex)
        obj.nextimageindex = (obj.nextimageindex < obj.postimages.length - 1) ? obj.nextimageindex + 1 : 0
        setTimeout("fadearray[" + obj.slideshowid + "].rotateimage()", obj.delay)
    }
}

fadeshow.prototype.populateslide = function( picobj, picindex )
{
    var slideHTML = ""

    slideHTML += this.billboard[picindex][0]

    picobj.innerHTML = slideHTML
}


fadeshow.prototype.rotateimage = function()
{
    if( this.pausecheck == 1 ) //if pause onMouseover enabled, cache object
        var cacheobj = this
    if( this.mouseovercheck == 1 )
        setTimeout(function()
        {
            cacheobj.rotateimage()
        }, 100)
    else if( iebrowser && dom || dom )
    {
        this.resetit()
        var crossobj = this.tempobj = iebrowser ? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
        crossobj.style.zIndex++
        fadeclear[this.slideshowid] = setInterval("fadepic(fadearray[" + this.slideshowid + "])", 50)
        this.curcanvas = (this.curcanvas == this.canvasbase + "_0") ? this.canvasbase + "_1" : this.canvasbase + "_0"
    }
    else
    {
        var ns4imgobj = document.images['defaultslide' + this.slideshowid]
        ns4imgobj.src = this.postimages[this.curimageindex].src
    }
    this.curimageindex = (this.curimageindex < this.postimages.length - 1) ? this.curimageindex + 1 : 0
}

fadeshow.prototype.resetit = function()
{
    this.degree = 10
    var crossobj = iebrowser ? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
    if( crossobj.filters && crossobj.filters[0] )
    {
        if( typeof crossobj.filters[0].opacity == "number" ) //if IE6+
            crossobj.filters(0).opacity = this.degree
        else //else if IE5.5-
            crossobj.style.filter = "alpha(opacity=" + this.degree + ")"
    }
    else if( crossobj.style.MozOpacity )
        crossobj.style.MozOpacity = this.degree / 101
    else if( crossobj.style.KhtmlOpacity )
        crossobj.style.KhtmlOpacity = obj.degree / 100
}


fadeshow.prototype.startit = function()
{
    var crossobj = iebrowser ? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
    this.populateslide(crossobj, this.curimageindex)
    if( this.pausecheck == 1 )
    { //IF SLIDESHOW SHOULD PAUSE ONMOUSEOVER
        var cacheobj = this
        var crossobjcontainer = iebrowser ? iebrowser["master" + this.slideshowid] : document.getElementById("master" + this.slideshowid)
        crossobjcontainer.onmouseover = function()
        {
            cacheobj.mouseovercheck = 1
        }
        crossobjcontainer.onmouseout = function()
        {
            cacheobj.mouseovercheck = 0
        }
    }
    this.rotateimage()
}