/*
	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
*/

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;

	css = d.createElement('link');
	css.setAttribute('href','slideshow2.css');
	css.setAttribute('rel','stylesheet');
	css.setAttribute('type','text/css');
	d.getElementsByTagName('head')[0].appendChild(css);

	if(d.getElementById('slideshow') != null){
		imgs = d.getElementById('slideshow').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,2500);
	}
}

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;
		setTimeout(so_xfade,2500);
	}
	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) + ')';
	}
}


/*
	Funzione che evidenzia la voce del sottomenu corrente, prendendo l'indirizzo, precisamente il valore di idpage e assegnando
	il listStyleImage appropriato alla voce di menu corrispondente.
*/
function evidenziaSubMenu(){
	tmp = window.location.href;
	var tmpVect = tmp.split("idpage=");
	var id = tmpVect[1];
	var li = document.getElementById(id);
	li.style.listStyleImage = "url(images/list_element.gif)";
}

/*
	Come sopra ma per il menu e va a cmabiare il colore, non a modificare il listStyleImage.
*/
function evidenziaMenu(){
	tmp = window.location.href;
	var tmpVect = tmp.split("idpage=");
	var idString = tmpVect[1];
	var id = idString[0];
	if(id < 6){
		var li = document.getElementById(id);
		li.firstChild.style.color = '#f5e7ff';
	}
}