// IXF1.11 :: Image cross-fade 
// *****************************************************
// DOM scripting by brothercake -- http://www.brothercake.com/
//******************************************************
//global object
var ixf = { 'clock' : null, 'count' : 1 }
/*******************************************************



/*****************************************************************************
 List the images that need to be cached
*****************************************************************************/

ixf.imgs = [
	'gifs/bg.gif',
	'jpegs/cover1.jpg',
	'jpegs/cover2.jpg',
	'jpegs/cover3.jpg',
	'jpegs/cover4.jpg',
	'jpegs/cover5.jpg',
	'jpegs/cover6.jpg',
	'jpegs/cover7.jpg',
	'jpegs/sitting.jpg',
	'jpegs/full.jpg',
	'jpegs/half.jpg',
	'jpegs/group.jpg',
	'jpegs/head.jpg',
	'jpegs/animals.jpg',
	'jpegs/about1.jpg',
	'jpegs/about2.jpg',
	'jpegs/about3.jpg',
	'jpegs/about4.jpg',
	'jpegs/about5.jpg',
	'jpegs/about6.jpg',
	'jpegs/contact1.jpg',
	'jpegs/contact2.jpg',
	'jpegs/contact3.jpg',
	'jpegs/contact4.jpg',
	'jpegs/contact5.jpg',
	'jpegs/contact6.jpg',
	];

/*****************************************************************************
*****************************************************************************/



//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];
}

linkPages = new Array("portfolio.html")

thisPic = 1
stopPic = 0

myPix1 = new Array("jpegs/cover1.jpg","jpegs/cover2.jpg","jpegs/cover3.jpg","jpegs/cover4.jpg","jpegs/cover5.jpg")
imgCt = myPix1.length - 1

myPix2 = new Array("gifs/bg.gif","jpegs/cover2.jpg","jpegs/sitting.jpg","jpegs/about1.jpg","jpegs/contact1.jpg")

myPix3 = new Array("gifs/bg.gif","jpegs/cover3.jpg","jpegs/full.jpg","jpegs/about2.jpg","jpegs/contact2.jpg")

myPix4 = new Array("gifs/bg.gif","jpegs/cover4.jpg","jpegs/half.jpg","jpegs/about3.jpg","jpegs/contact3.jpg")

myPix5 = new Array("gifs/bg.gif","jpegs/cover5.jpg","jpegs/group.jpg","jpegs/about4.jpg","jpegs/contact4.jpg")

myPix6 = new Array("gifs/bg.gif","jpegs/cover6.jpg","jpegs/head.jpg","jpegs/about5.jpg","jpegs/contact5.jpg")

myPix7 = new Array("gifs/bg.gif","jpegs/cover7.jpg","jpegs/animals.jpg","jpegs/about6.jpg","jpegs/contact6.jpg")



function chgPage() {
		if (thisPic == 0 ) {
		window.location.href = linkPages[thisPic + linkPages.length - 1]
		}
		else {
		window.location.href = linkPages[thisPic - 2]
		}
}

function startSlide1() {
		setTimeout("chgSlide()",1000)
}

function startSlide2() {
		setTimeout("chgSlide2()",1400)
}

function startSlide2a() {thisPic = 2
		setTimeout("chgSlide2()",1400)
}

function startSlide2b() {thisPic = 3
		setTimeout("chgSlide2()",1400)
}

function startSlide2c() {thisPic = 4
		setTimeout("chgSlide2()",1400)
}

function startSlide3() {
		setTimeout("chgSlide3()",1400)
}

function startSlide4() {
		setTimeout("chgSlide4()",1400)
}

function startSlide5() {
		setTimeout("chgSlide5()",1400)
}

function startSlide6() {
		setTimeout("chgSlide6()",1400)
}

function startSlide7() {
		setTimeout("chgSlide7()",1400)
}

function chgSlide() {
	if (stopPic == 0) {
		crossfade(document.getElementById('pic1'), myPix1[thisPic], '2')
		thisPic = thisPic +1
		if (thisPic > imgCt) {
			thisPic = 0	
		}
		setTimeout("chgSlide()", 5000)

	}
}

function chgSlide1() {
	if (stopPic == 0) {
		crossfade(document.getElementById('pic1'), myPix1[thisPic], '1.5')
		startSlide2()
	}
}

function chgSlide2() {
		crossfade(document.getElementById('pic2'), myPix2[thisPic], '1.5')
		startSlide3()
}

function chgSlide3() {
		crossfade(document.getElementById('pic3'), myPix3[thisPic], '1.5')
		startSlide4()
}

function chgSlide4() {
		crossfade(document.getElementById('pic4'), myPix4[thisPic], '1.5')
		startSlide5()
}

function chgSlide5() {
		crossfade(document.getElementById('pic5'), myPix5[thisPic], '1.5')
		startSlide6()
}

function chgSlide6() {
		crossfade(document.getElementById('pic6'), myPix6[thisPic], '1.5')
		startSlide7()
}

function chgSlide7() {
		crossfade(document.getElementById('pic7'), myPix7[thisPic], '1.5')
		if (thisPic == 0) {thisPic = 2
		setTimeout("chgPage()",1000)
		}
		else {thisPic = 0
		}	
}

function stopSlide() {
	stopPic = 1
}

function restartSlide() {
	stopPic = 0
	chgSlide()
}

function setVisibility(id) {
	if(x==1){
	document.all[id].style.display = 'block'
	x = 0
	}
	else {
	document.all[id].style.display = 'none'
	x = 1
	}
}

function setVisibility2(id1,id2) {
	if(document.all[id2].style.display != 'none'){
	document.all[id2].style.display = 'none'
	document.all[id1].style.display = 'block'
	}
	else {
	}
}

	function newWindow(linkurl) {
		linkWindow = window.open(linkurl, 'linkWin', 'toolbar=yes,location=yes,scrollbars=yes,resizable=yes,width=675,height=650')
		linkWindow.focus()
	}

	function newWindow2(linkurl2) {
		linkWindow = window.open(linkurl2, 'linkWin2', 'toolbar=no,location=yes,scrollbars=yes,resizable=yes,width=420,height=350')
		linkWindow.focus()
	}

	


//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);
	}
};



//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;
};