//global object
var ixf = {
    'clock' : null,
    'count' : 1
}
/*
 List the images that need to be cached
*/

ixf.imgs = [];

//cache the images
ixf.imgsLen = ixf.imgs.length;
ixf.cache = [];
for(var i=0; i<ixf.imgsLen; i++)
{
    ixf.cache[i] = new Image;
    ixf.cache[i].src = ixf.imgs[i];
}

function MM_preloadImages() { //v3.0
    var d=document;
    if(d.images){
        if(!d.MM_p) d.MM_p=new Array();
        var i,j=d.MM_p.length,a=MM_preloadImages.arguments;
        for(i=0; i<a.length; i++)
            if (a[i].indexOf("#")!=0){
                d.MM_p[j]=new Image;
                d.MM_p[j++].src=a[i];
            }
    }
}

function MM_swapImgRestore() { //v3.0
    var i,x,a=document.MM_sr;
    for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}


function MM_findObj(n, d) { //v4.01
    var p,i,x;
    if(!d) d=document;
    if((p=n.indexOf("?"))>0&&parent.frames.length) {
        d=parent.frames[n.substring(p+1)].document;
        n=n.substring(0,p);
    }
    if(!(x=d[n])&&d.all) x=d.all[n];
    for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
    for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
    if(!x && d.getElementById) x=d.getElementById(n);
    return x;
}

function MM_swapImage()
{ //v3.0
    var i,j=0,x,a=MM_swapImage.arguments;
    document.MM_sr=new Array;
    for(i=0;i<(a.length-2);i+=3)
        if ((x=MM_findObj(a[i]))!=null)
        {
            document.MM_sr[j++]=x;
            if(!x.oSrc) x.oSrc=x.src;
            x.src=a[i+2];
        }
}
//crossfade setup function
function crossfade()
{
    //if the timer is not already going
    if(ixf.clock == null)
    {
        //copy the image object
        ixf.obj = arguments[0];
		
        //copy the image src argument
        ixf.src = arguments[1];
		
        //store the supported form of opacity
        if(typeof ixf.obj.style.opacity != 'undefined')
        {
            ixf.type = 'w3c';
        }
        else if(typeof ixf.obj.style.MozOpacity != 'undefined')
        {
            ixf.type = 'moz';
        }
        else if(typeof ixf.obj.style.KhtmlOpacity != 'undefined')
        {
            ixf.type = 'khtml';
        }
        else if(typeof ixf.obj.filters == 'object')
        {
            //weed out win/ie5.0 by testing the length of the filters collection (where filters is an object with no data)
            //then weed out mac/ie5 by testing first the existence of the alpha object (to prevent errors in win/ie5.0)
            //then the returned value type, which should be a number, but in mac/ie5 is an empty string
            ixf.type = (ixf.obj.filters.length > 0 && typeof ixf.obj.filters.alpha == 'object' && typeof ixf.obj.filters.alpha.opacity == 'number') ? 'ie' : 'none';
        }
        else
        {
            ixf.type = 'none';
        }
		
        //change the image alt text if defined
        if(typeof arguments[3] != 'undefined' && arguments[3] != '')
        {
            ixf.obj.alt = arguments[3];
        }
		
        //if any kind of opacity is supported
        if(ixf.type != 'none')
        {
            //create a new image object and append it to body
            //detecting support for namespaced element creation, in case we're in the XML DOM
            ixf.newimg = document.getElementsByTagName('body')[0].appendChild((typeof document.createElementNS != 'undefined') ? document.createElementNS('http://www.w3.org/1999/xhtml', 'img') : document.createElement('img'));

            //set positioning classname
            ixf.newimg.className = 'idupe';
			
            //set src to new image src
            ixf.newimg.src = ixf.src

            //move it to superimpose original image
            ixf.newimg.style.left = ixf.getRealPosition(ixf.obj, 'x') + 'px';
            ixf.newimg.style.top = ixf.getRealPosition(ixf.obj, 'y') + 'px';
			
            //copy and convert fade duration argument
            ixf.length = parseInt(arguments[2], 10) * 1000;
			
            //create fade resolution argument as 20 steps per transition
            ixf.resolution = parseInt(arguments[2], 10) * 20;
			
            //start the timer
            ixf.clock = setInterval('ixf.crossfade()', ixf.length/ixf.resolution);
        }
	
        //otherwise if opacity is not supported
        else
        {
            //just do the image swap
            ixf.obj.src = ixf.src;
        }
		
    }
}


//crossfade timer function
ixf.crossfade = function()
{
    //decrease the counter on a linear scale
    ixf.count -= (1 / ixf.resolution);
	
    //if the counter has reached the bottom
    if(ixf.count < (1 / ixf.resolution))
    {
        //clear the timer
        clearInterval(ixf.clock);
        ixf.clock = null;
		
        //reset the counter
        ixf.count = 1;
		
        //set the original image to the src of the new image
        ixf.obj.src = ixf.src;
    }
	
    //set new opacity value on both elements
    //using whatever method is supported
    switch(ixf.type)
    {
        case 'ie' :
            ixf.obj.filters.alpha.opacity = ixf.count * 100;
            ixf.newimg.filters.alpha.opacity = (1 - ixf.count) * 100;
            break;
			
        case 'khtml' :
            ixf.obj.style.KhtmlOpacity = ixf.count;
            ixf.newimg.style.KhtmlOpacity = (1 - ixf.count);
            break;
			
        case 'moz' :
            //restrict max opacity to prevent a visual popping effect in firefox
            ixf.obj.style.MozOpacity = (ixf.count == 1 ? 0.9999999 : ixf.count);
            ixf.newimg.style.MozOpacity = (1 - ixf.count);
            break;
			
        default :
            //restrict max opacity to prevent a visual popping effect in firefox
            ixf.obj.style.opacity = (ixf.count == 1 ? 0.9999999 : ixf.count);
            ixf.newimg.style.opacity = (1 - ixf.count);
    }
	
    //now that we've gone through one fade iteration
    //we can show the image that's fading in
    ixf.newimg.style.visibility = 'visible';
	
    //keep new image in position with original image
    //in case text size changes mid transition or something
    ixf.newimg.style.left = ixf.getRealPosition(ixf.obj, 'x') + 'px';
    ixf.newimg.style.top = ixf.getRealPosition(ixf.obj, 'y') + 'px';
	
    //if the counter is at the top, which is just after the timer has finished
    if(ixf.count == 1)
    {
        //remove the duplicate image
        ixf.newimg.parentNode.removeChild(ixf.newimg);
    }
};


//crosswipe setup function
function crosswipe()
{
    //if the timer is not already going
    if(ixf.clock == null)
    {
        //copy the image object
        ixf.obj = arguments[0];
		
        //get its dimensions
        ixf.size = {
            'w' : ixf.obj.width,
            'h' : ixf.obj.height
        };
		
        //copy the image src argument
        ixf.src = arguments[1];
		
        //change the image alt text if defined
        if(typeof arguments[4] != 'undefined' && arguments[4] != '')
        {
            ixf.obj.alt = arguments[4];
        }

        //if dynamic element creation is supported
        if(typeof document.createElementNS != 'undefined' || typeof document.createElement != 'undefined')
        {
            //create a new image object and append it to body
            //detecting support for namespaced element creation, in case we're in the XML DOM
            ixf.newimg = document.getElementsByTagName('body')[0].appendChild((typeof document.createElementNS != 'undefined') ? document.createElementNS('http://www.w3.org/1999/xhtml', 'img') : document.createElement('img'));

            //set positioning classname
            ixf.newimg.className = 'idupe';

            //set src to new image src
            ixf.newimg.src = ixf.src

            //move it to superimpose original image
            ixf.newimg.style.left = ixf.getRealPosition(ixf.obj, 'x') + 'px';
            ixf.newimg.style.top = ixf.getRealPosition(ixf.obj, 'y') + 'px';

            //set it to be completely hidden with clip
            ixf.newimg.style.clip = 'rect(0, 0, 0, 0)';

            //show the image
            ixf.newimg.style.visibility = 'visible';

            //copy and convert fade duration argument
            ixf.length = parseInt(arguments[2], 10) * 1000;

            //create fade resolution argument as 20 steps per transition
            ixf.resolution = parseInt(arguments[2], 10) * 20;

            //copy slide direction argument
            ixf.dir = arguments[3];

            //start the timer
            ixf.clock = setInterval('ixf.crosswipe()', ixf.length/ixf.resolution);
        }
		
        //otherwise if dynamic element creation is not supported
        else
        {
            //just do the image swap
            ixf.obj.src = ixf.src;
        }
		
    }
}


//crosswipe timer function
ixf.crosswipe = function()
{
    //decrease the counter on a linear scale
    ixf.count -= (1 / ixf.resolution);
	
    //if the counter has reached the bottom
    if(ixf.count < (1 / ixf.resolution))
    {
        //clear the timer
        clearInterval(ixf.clock);
        ixf.clock = null;
		
        //reset the counter
        ixf.count = 1;
		
        //set the original image to the src of the new image
        ixf.obj.src = ixf.src;
    }
	
    //animate the clip of the new image
    //using the width and height properties we saved earlier
    ixf.newimg.style.clip = 'rect('
    + ( (/bt|bltr|brtl/.test(ixf.dir)) ? (ixf.size.h * ixf.count) : (/che|cc/.test(ixf.dir)) ? ((ixf.size.h * ixf.count) / 2) : (0) )
    + 'px, '
    + ( (/lr|tlbr|bltr/.test(ixf.dir)) ? (ixf.size.w - (ixf.size.w * ixf.count)) : (/cve|cc/.test(ixf.dir)) ? (ixf.size.w - ((ixf.size.w * ixf.count) / 2)) : (ixf.size.w) )
    + 'px, '
    + ( (/tb|tlbr|trbl/.test(ixf.dir)) ? (ixf.size.h - (ixf.size.h * ixf.count)) : (/che|cc/.test(ixf.dir)) ? (ixf.size.h - ((ixf.size.h * ixf.count) / 2)) : (ixf.size.h) )
    + 'px, '
    + ( (/lr|tlbr|bltr/.test(ixf.dir)) ? (0) : (/tb|bt|che/.test(ixf.dir)) ? (0) : (/cve|cc/.test(ixf.dir)) ? ((ixf.size.w * ixf.count) / 2) : (ixf.size.w * ixf.count) )
    + 'px)';
			
    //keep new image in position with original image
    //in case text size changes mid transition or something
    ixf.newimg.style.left = ixf.getRealPosition(ixf.obj, 'x') + 'px';
    ixf.newimg.style.top = ixf.getRealPosition(ixf.obj, 'y') + 'px';
	
    //if the counter is at the top, which is just after the timer has finished
    if(ixf.count == 1)
    {
        //remove the duplicate image
        ixf.newimg.parentNode.removeChild(ixf.newimg);
    }
};


//get real position method
ixf.getRealPosition = function()
{
    this.pos = (arguments[1] == 'x') ? arguments[0].offsetLeft : arguments[0].offsetTop;
    this.tmp = arguments[0].offsetParent;
    while(this.tmp != null)
    {
        this.pos += (arguments[1] == 'x') ? this.tmp.offsetLeft : this.tmp.offsetTop;
        this.tmp = this.tmp.offsetParent;
    }
	
    return this.pos;
};
var counter = 1;
var intervalId = '';
function loopCross(iname, imgNum){

    clearInterval(intervalId);
    counter = 1;
    intervalId = setInterval(function(){
        swapit(iname, imgNum)
        },5000);
    
}
function swapit(iname, imgNum){

    var numImg = imgNum;
    var itemName = iname;
    counter = counter+1;
    if (counter >numImg)
        counter = 1;
    crossfade(document.getElementById('mainphoto'), 'img/'+ itemName + counter + '.jpg', '1');
}