var d=document;
var imgs = new Array();
var player_time;
var current=0;

function so_init(popup) {
	var i;
	
	imgs = d.getElementById(popup).getElementsByTagName("img");
	
	for(i=0;i<imgs.length;i++){
		if(imgs[i].style.display == 'block'){
			imgs[i].xOpacity = .99;
			setOpacity(imgs[i]);
			imgs[i].style.display = 'block';
			current = i;
		} else {
			imgs[i].xOpacity = 0;
		}
	}
	
	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) + ")";
	}
}

function nextSlide(){
	clearTimeout(player_time);	
	switchNextSlide();
}

function switchNextSlide(){
	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;
	} else {
		player_time = setTimeout(switchNextSlide,30);
	}
	
	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) + ")";
	}
}

function prevSlide(){	
	clearTimeout(player_time);
	switchPrevSlide();
}

function switchPrevSlide(){
	cOpacity = imgs[current].xOpacity;
	subCurrent = current-1;
	
	if(subCurrent < 0){
		subCurrent = imgs.length-1;
	}
	
	nIndex = subCurrent;
		
	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;
	} else {
		player_time = setTimeout(switchPrevSlide,30);	
	}
	
	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) + ")";
	}
}