// JavaScript Document

/* bilder slider */


function setOpacity() {
	
	iOpacityValue=iOpacityValue-1;

	o=document.getElementById('img_0');
	o1=document.getElementById('img_1');
	o.style.opacity = iOpacityValue/10;
	o.style.filter = 'alpha(opacity=' + iOpacityValue*10 + ')';
	o1.style.opacity = iOpacityValue/10;
	o1.style.filter = 'alpha(opacity=' + iOpacityValue*10 + ')';
	if(iOpacityValue==0){
		window.clearInterval(iTimer);
		iOpacityValue=10;
		o.src=document.getElementById('img_2').src
		o1.src=document.getElementById('img_3').src
		
			o.style.opacity = 1;
			o.style.filter = 'alpha(opacity=' + 100 + ')';
			if(document.getElementById('img_3').style.visibility!='hidden'){
				o1.style.opacity = 1;
				o1.style.filter = 'alpha(opacity=' + 100 + ')';
			}
	}
}
var iTimer;
var iOpacityValue=10;
function fadeOut(){
	
	iTimer=window.setInterval("setOpacity()",100);
}


var ThumbScrollPosition=0;
var nextDisabled=false
var prevDisabled=true;

function enableDisableNext(){
	if(ThumbScrollPosition+2>=gArrImages.length){
		document.getElementById('next_image').style.visibility='hidden';
		return false;
	}else{
		document.getElementById('next_image').style.visibility='visible';
		return true;
	}
	
}

function enableDisablePrev(){
	if(ThumbScrollPosition==0){
		document.getElementById('prev_image').style.visibility='hidden';
		return false
	}else{
		document.getElementById('prev_image').style.visibility='visible';
		return true
	}
}

var upperSet=1
function scrollNext(){
	enableDisablePrev()
		if(!enableDisableNext()){
		// if there is no next page
		return false;
	}
	ThumbScrollPosition=ThumbScrollPosition+2;
	html='';
	html2='';
	loaded=false
	for(i=ThumbScrollPosition;(i<gArrImages.length && i< ThumbScrollPosition+2);i++){
			document.getElementById('img_3').style.visibility='hidden';
			if(!loaded){
			
			document.getElementById('img_2').src=gArrImages[i];
			document.getElementById('img_2').style.visibility='visible'
				loaded=true;
			}else{
				document.getElementById('img_3').src=gArrImages[i];
				document.getElementById('img_3').style.visibility='visible';
			}
	}
	fadeOut();
	
	//check to disable if the re is no next page
	enableDisableNext()
	enableDisablePrev()
}

function scrollPrev(){
	enableDisableNext()
	if(!enableDisablePrev()){
		// if there is no prev page
		return false;
	}
	ThumbScrollPosition=ThumbScrollPosition-4;
	scrollNext();
	//enable next
}
/* bilder slider*/