/* 
Javascript for www.acsteacher.co.uk 
Vince Robbins, 5 March 2009
*/
var imgnr=1;
var imgmax=4;
var interval=0;
var rolling=false;


function test(){
	alert("JS OK");
}
function IGNORErotate(){
	rolling=!rolling;
	if (rolling){
		nextimg();
		interval=self.setInterval("nextimg()",2000);
	} else {
		clearInterval(interval);
	}
}
 // for (var=startvalue;var<=endvalue;var=var+increment) 
function rollthenstop(){ // Roll slideshow for set number of seconds then stop 
	imgnr=0;
	// Start rolling show
	nextimg();
	// Repeat every n seconds
	interval=self.setInterval("nextimg()",4000);
	// Interrupt after set period
	setTimeout('haltrollingshow()', 30000);  
}
function haltrollingshow(){ // Stop the current slideshow & end with preferred image
	clearInterval(interval);
	// Set imgnr to last image
	imgnr=imgmax;
	// Display first image (i.e. the main/preferred image
	nextimg();
}
// setTimeout('animBall()', 80);      // run the function animBall after 80 milliseconds. 
// setInterval('animBall()', 80);      // run the function animBall() every 80 milliseconds. 

function slideshow(){
	rolling=!rolling;
	if (rolling){
		nextimg();
		interval=self.setInterval("nextimg()",4000);
	} else {
		clearInterval(interval);
	}
}
function nextimg(){
	imgnr=imgnr+1;
	if (imgnr>imgmax) imgnr=1;
	switch (imgnr){
	case 1 :
		crossfade(document.getElementById('bigpic'), '/images/library-1-250.jpg', '1', 'Library 1');
		break;
	case 2 :
		crossfade(document.getElementById('bigpic'), '/images/library-2-250.jpg', '1', 'Library 2');
		break;
	case 3 :
		crossfade(document.getElementById('bigpic'), '/images/library-3-250.jpg', '1', 'Library 3');
		break;
	default :
		crossfade(document.getElementById('bigpic'), '/images/library-4-250.jpg', '1', 'Library 4');
		break;
	}
}


// 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 = [
	'/images/library-1-250.jpg',
	'/images/library-2-250.jpg',
	'/images/library-3-250.jpg',
	'/images/library-4-250.jpg',
	'/images/library-1-250.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];
}


//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()
{ //alert("this.pos is "+this.pos);
	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;
};




















/*




function slideshowMS(){
// Dynamicly Generated JavaScript Resources
//

var SlideShowControl= 
{
	ImgBtn: 
	{
		FullSize: 
		{
			ToolTip: 'View full-sized photos'
		},
		Next: 
		{
			ToolTip: 'Next'
		},
		Pause: 
		{
			ToolTip: 'Pause'
		},
		Play: 
		{
			ToolTip: 'Play'
		},
		Prev: 
		{
			ToolTip: 'Previous'
		},
		Stop: 
		{
			ToolTip: 'Stop'
		}
	},
	Msg: 
	{
		DesignTime: 'Images will be displayed here when the page is viewed in the browser.',
		JavaScript_Required: 'JavaScript must be enabled to view images.',
		Loading_Image: 'Loading...',
		Missing_Image: 'Image is missing'
	},
	TxtBtn: 
	{
		Close: 
		{
			Text: 'Close'
		}

	}

}
slideshow2();
}

function slideshow2(){
		var ctl00_IWS_WH_CPH_Content_SlideshowControl1;
		setTimeout('ctl00_IWS_WH_CPH_Content_SlideshowControl1 = new iws.SlideShowControl(\'ctl00_IWS_WH_CPH_Content_SlideshowControl1\', \'en-GB\', \'\', 5, 1, 0, \'http://www.acsteacher.co.uk/images/library-l.jpg\' , \'\', \'http://www.acsteacher.co.uk/images/library-2.jpg\' , \'\', \'http://www.acsteacher.com/images/library-3.jpg\' , \'\', \'http://acsteacher.co.uk/images/library-4.jpg\' , \'\');', 150);
}

*/