/*
	Image Cross Fade Redux
	Version 1.0
	Last revision: 02.15.2006
	steve@slayeroffice.com

	Rewrite of old code found here: http://slayeroffice.com/code/imageCrossFade/index.html
	
	Source: http://sonspring.com/journal/slideshow-alternative
	Amended by S.Pope 2007/03/20 to fit purpose
*/

window.addEventListener?window.addEventListener('load',so_init,false):window.attachEvent('onload',so_init);

var d=document, imgs = new Array(), zInterval = null, current=0, pause=false, link;

function so_init()
{
	if(!d.getElementById || !d.createElement)return;

	imgs = d.getElementById('rotator').getElementsByTagName('img');
	    for(i=1;i<imgs.length;i++) imgs[i].xOpacity = 0;
	    
	    imgs[0].style.display = 'block';
	    imgs[0].xOpacity = .99;
        setTimeout(so_xfade,3000);
}

function so_xfade()
{
	cOpacity = imgs[current].xOpacity;
	nIndex = imgs[current+1]?current+1:0;
	nOpacity = imgs[nIndex].xOpacity;

	cOpacity-=.05;
	nOpacity+=.05;

	imgs[nIndex].style.display = 'block';
	imgs[current].xOpacity = cOpacity;
	imgs[nIndex].xOpacity = nOpacity;

	setOpacity(imgs[current]);
	setOpacity(imgs[nIndex]);

	if(cOpacity<=0)
	{
		imgs[current].style.display = 'none';
		current = nIndex;
		//change the link
		link = d.getElementById('shoplink')		
		if(imgs[current].title == 'Asda')
		{   
		    link.href='http://www.asda.com/asda_shop/sys/web_sys01_b_initialise.jsp';
		}
		else if(imgs[current].title == 'Tesco')
		{
		    link.href='http://www.Tesco.com';
		}
		else if(imgs[current].title == 'Ocado')
		{
		    link.href='http://www.ocado.com/webshop/startWebshop.do?affiliate=unilever-persil';
		}
		else if(imgs[current].title == 'Sainsbury\'s')
		{
		    link.href='http://www.sainsburys.co.uk';
		}
		
		setTimeout(so_xfade,3000);
	}
	else
	{
		setTimeout(so_xfade,50);
	}

	function setOpacity(obj)
	{
		if(obj.xOpacity>0)
		{
			obj.xOpacity = 0;
			return;
		}

		obj.style.opacity = obj.xOpacity;
		obj.style.MozOpacity = obj.xOpacity;
		obj.style.filter = 'alpha(opacity=' + (obj.xOpacity*100) + ')';
	}
}