/*
	Dynamic Header
	
	Giulio Ferrara
	2008/12/04
	
	Rewrite of old code found here: http://slayeroffice.com/code/imageCrossFade/index.html
*/

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;

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

	imgs = d.getElementById('slideshow').getElementsByTagName('img');
	divs = d.getElementById('slideshow').getElementsByTagName('div');
	ps   = d.getElementById('slideshow').getElementsByTagName('p');
	for(i=1;i<imgs.length;i++) 
	{
		imgs[i].xOpacity = 0;
		ps[i].xOpacity = 0;
	}
	imgs[0].style.display = 'block';
	imgs[0].xOpacity = .99;
	
	divs[0].style.display = 'block';

	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';
		divs[current].style.display = 'none';
		divs[nIndex].style.display = 'block';
		current = nIndex;
		setTimeout(so_xfade,3000);
	}
	else
	{
		setTimeout(so_xfade,50);
	}
}

function setOpacity(obj)
{
	if(obj.xOpacity>.99)
	{
		obj.xOpacity = .99;
		return;
	}

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