/***********************************************************************************************
	Copyright (c) 2005 - Alf Magne Kalleland post@dhtmlgoodies.com
	UPDATE LOG:
	March, 10th, 2006 : Added support for a message while large image is loading
	Get this and other scripts at www.dhtmlgoodies.com
	You can use this script freely as long as this copyright message is kept intact.
	***********************************************************************************************/ 

	var imageGalleryLeftPos = false;
	var imageGalleryWidth = false;
	var imageGalleryObj = false;
	var maxGalleryXPos = false;
	var slideSpeed = 0;

	function startSlide(e)
	{
		if(document.all)e = event;
		var id = this.id;
		this.getElementsByTagName('IMG')[0].src = '/elementi/img/' + this.id + '_over.gif';
		if(this.id=='arrow_right'){
			slideSpeedMultiply = Math.floor((e.clientX - this.offsetLeft) / 50);
			slideSpeed = -1*slideSpeedMultiply;
			slideSpeed = Math.max(-10,slideSpeed);
		}else{
			slideSpeedMultiply = 10 - Math.floor((e.clientX - this.offsetLeft) / 50);
			slideSpeed = 1*slideSpeedMultiply;
			slideSpeed = Math.min(10,slideSpeed);
			if(slideSpeed<0)slideSpeed=10;
		}
		//alert(slideSpeed);
	}

	function releaseSlide()
	{
		var id = this.id;
		this.getElementsByTagName('IMG')[0].src = '/elementi/img/' + this.id + '.gif';
		slideSpeed=0;
	}

	function gallerySlide()
	{
		if(slideSpeed!=0){
			var leftPos = imageGalleryObj.offsetLeft;
			leftPos = leftPos/1 + slideSpeed;
			if(leftPos>maxGalleryXPos){
				leftPos = maxGalleryXPos;
				slideSpeed = 0;
			}
			if(leftPos<minGalleryXPos){
				leftPos = minGalleryXPos;
				slideSpeed=0;
			}
			imageGalleryObj.style.left = leftPos + 'px';
		}
		setTimeout('gallerySlide()',20);
		
	}

	function revealThumbnail()
	{
		this.style.filter = 'alpha(opacity=100)';
		this.style.opacity = 1;
	}

	function hideThumbnail()
	{
		this.style.filter = 'alpha(opacity=50)';
		this.style.opacity = 0.5;
	}

	function initSlideShow()
	{
		imageGalleryObj = document.getElementById('theImages');
		imageGalleryLeftPos = imageGalleryObj.offsetLeft;
		imageGalleryWidth = document.getElementById('galleryContainer').offsetWidth - 30;
		maxGalleryXPos = imageGalleryObj.offsetLeft; 
		minGalleryXPos = imageGalleryWidth - document.getElementById('slideEnd').offsetLeft;
		var slideshowImages = imageGalleryObj.getElementsByTagName('IMG');
		for(var no=0;no<slideshowImages.length;no++){
			slideshowImages[no].onmouseover = revealThumbnail;
			slideshowImages[no].onmouseout = hideThumbnail;
			slideshowImages[no].style.filter = 'alpha(opacity=50)';
			slideshowImages[no].style.opacity = 0.5;
		}
		if(slideshowImages.length > 12){
			document.getElementById('arrow_left').onmousemove = startSlide;
			document.getElementById('arrow_left').onmouseout = releaseSlide;
			document.getElementById('arrow_right').onmousemove = startSlide;
			document.getElementById('arrow_right').onmouseout = releaseSlide;
			gallerySlide();
		}
	}

	window.onload = initSlideShow;