/************************************************************************************************************
	(C) www.dhtmlgoodies.com, June 2006
	
	This is a script from www.dhtmlgoodies.com. You will find this and a lot of other scripts at our website.	
	
	Terms of use:
	You are free to use this script as long as the copyright message is kept intact. However, you may not
	redistribute, sell or repost it without our permission.
	
	Thank you!
	
	www.dhtmlgoodies.com
	Alf Magne Kalleland
	
	************************************************************************************************************/	

	
	
	
	var opacitySpeed = 2; // Speed of opacity - switching between large images - Lower = faster
	var opacitySteps = 10; // Also speed of opacity - Higher = faster
	var slideSpeed = 5; // Speed of thumbnail slide - Lower = faster
	var slideSteps = 10; // Also speed of thumbnail slide - Higher = faster
	var columnsOfThumbnails = false;	// Hardcoded number of thumbnail columns, use false if you want the script to figure it out dynamically.
	var step_immagini = 2;
	var passi = 0;
	var numero_passo = 0;

	/* Don't change anything below here */
	var DHTMLgoodies_largeImage = false;
	var DHTMLgoodies_imageToShow = false;
	var DHTMLgoodies_currentOpacity = 100;
	var DHTMLgoodies_slideWidth = false;
	var DHTMLgoodies_thumbTotalWidth = false;
	var DHTMLgoodies_viewableWidth = false;
	
	var currentUnqiueOpacityId = false;
	var DHTMLgoodies_currentActiveImage = false;
	var DHTMLgoodies_thumbDiv = false;
	var DHTMLgoodies_thumbSlideInProgress = false;
	
	var browserIsOpera = navigator.userAgent.indexOf('Opera')>=0?true:false;
	var leftArrowObj;
	var rightArrowObj;
	var thumbsColIndex = 1;
	var thumbsLeftPos = false;
	
	function slideThumbs(speed,currentPos)
	{  var leftPos;
		if(thumbsLeftPos){
			leftPos= thumbsLeftPos;
		}else{
			leftPos = DHTMLgoodies_thumbDiv.style.left.replace('px','')/1;
			thumbsLeftPos = leftPos;
		}
		currentPos = currentPos + Math.abs(speed);		
		var tmpLeftPos = leftPos;
		leftPos = leftPos + speed;
		thumbsLeftPos = leftPos;
		DHTMLgoodies_thumbDiv.style.left = leftPos + 'px';
		if(currentPos<step_immagini*DHTMLgoodies_slideWidth){
			setTimeout('slideThumbs(' + speed + ',' + currentPos + ')',slideSpeed);
		}else{
			if(tmpLeftPos>=0 || (columnsOfThumbnails && thumbsColIndex==1)){
				document.getElementById('DHTMLgoodies_leftArrow').style.visibility='hidden';
			}	
			var left = tmpLeftPos;		
			var showArrow = true;
			if(DHTMLgoodies_thumbTotalWidth + left - (DHTMLgoodies_slideWidth)/2 <= DHTMLgoodies_viewableWidth){
				showArrow=false;
			}
			if(columnsOfThumbnails){
				if((thumbsColIndex+1)<columnsOfThumbnails){
					showArrow=true;
				}else{
				showArrow = false;
				}
			}			
			if(!showArrow){
				document.getElementById('DHTMLgoodies_rightArrow').style.visibility='hidden';
			}					
			DHTMLgoodies_thumbSlideInProgress = false;
		}
	
	}
		//CHIAMATA AL CLICK SULLE FRECCE
	function moveThumbnails()
	{
		
		if(DHTMLgoodies_thumbSlideInProgress){
		return;
		}
		DHTMLgoodies_thumbSlideInProgress = true;
		
		//CHIAMATA SE CLICK SU FRECCIA SINISTRA
		if(this.id=='DHTMLgoodies_leftArrow'){
			numero_passo--;	
			//thumbsColIndex--;
			rightArrowObj.style.visibility='visible';
			//if(DHTMLgoodies_thumbDiv.style.left.replace('px','')/1>=0){
			//	leftArrowObj.style.visibility='hidden';
			//	DHTMLgoodies_thumbSlideInProgress = false;
			//	return;
			//}
			if(numero_passo===0){
				leftArrowObj.style.visibility='hidden';
				DHTMLgoodies_thumbSlideInProgress = false;
				//return;
			}
			
			slideThumbs(slideSteps,0);
			
		//CHIAMATA SE CLICK SU FRECCIA DESTRA
		}else{
			//thumbsColIndex++;
			numero_passo++;
			leftArrowObj.style.visibility='visible';
			//var left = DHTMLgoodies_thumbDiv.style.left.replace('px','')/1;	
			var showArrow = true;
			//if(DHTMLgoodies_thumbTotalWidth + left - (DHTMLgoodies_slideWidth)/2<= DHTMLgoodies_viewableWidth)showArrow = false;
			if(numero_passo == (passi)){
					showArrow = false;
			}

			//if(columnsOfThumbnails)showArrow = true; CONTROLLAREEEEEEEEEEEEEEEEEEE!
				
			if(!showArrow)	
			{
				rightArrowObj.style.visibility='hidden';
				DHTMLgoodies_thumbSlideInProgress = false;
				//return;
			}	
			
			slideThumbs((slideSteps*-1),0);
		}	
		
	}
	function setOpacity()
	{
		if(document.all)
		{
			DHTMLgoodies_largeImage.style.filter = 'alpha(opacity=' + DHTMLgoodies_currentOpacity + ')';
		}else{
			DHTMLgoodies_largeImage.style.opacity = DHTMLgoodies_currentOpacity/100;
		}		
	}
	
	function moveOpacity(speed,uniqueId)
	{
		
		if(browserIsOpera){
			DHTMLgoodies_largeImage.src = DHTMLgoodies_imageToShow;
			return;
		}
		
		DHTMLgoodies_currentOpacity = DHTMLgoodies_currentOpacity + speed;
		if(DHTMLgoodies_currentOpacity<=5 && speed<0){
		
			var tmpParent = DHTMLgoodies_largeImage.parentNode; 
			DHTMLgoodies_largeImage.parentNode.removeChild(DHTMLgoodies_largeImage);
			DHTMLgoodies_largeImage = document.createElement('IMG');
			tmpParent.appendChild(DHTMLgoodies_largeImage);
			setOpacity();
			DHTMLgoodies_largeImage.src = DHTMLgoodies_imageToShow;
		
			speed=opacitySteps;
		}
		if(DHTMLgoodies_currentOpacity>=99 && speed>0){
			DHTMLgoodies_currentOpacity=99;
		}
		setOpacity();	
		if(DHTMLgoodies_currentOpacity>=99 && speed>0){
			return;	
			}
		if(uniqueId==currentUnqiueOpacityId){
			setTimeout('moveOpacity(' + speed + ',' + uniqueId + ')',opacitySpeed);
		}
	}
	
	function showPreview(imagePath,inputObj)
	{		
		if(DHTMLgoodies_currentActiveImage){
			if(DHTMLgoodies_currentActiveImage==inputObj.getElementsByTagName('IMG')[0]){
				return;
			}
			DHTMLgoodies_currentActiveImage.className='';
		}
		DHTMLgoodies_currentActiveImage = inputObj.getElementsByTagName('IMG')[0];
		DHTMLgoodies_currentActiveImage.className='activeImage';
		
		DHTMLgoodies_imageToShow = imagePath;
		var tmpImage = new Image();
		tmpImage.src = imagePath;
		currentUnqiueOpacityId = Math.random();
		moveOpacity(opacitySteps*-1,currentUnqiueOpacityId);
	}
	
	
	function moveOpacity(speed,uniqueId)
	{
		
		if(browserIsOpera){
			DHTMLgoodies_largeImage.src = DHTMLgoodies_imageToShow;
			return;
		}
		
		DHTMLgoodies_currentOpacity = DHTMLgoodies_currentOpacity + speed;
		if(DHTMLgoodies_currentOpacity<=5 && speed<0){
		
			var tmpParent = DHTMLgoodies_largeImage.parentNode; 
			DHTMLgoodies_largeImage.parentNode.removeChild(DHTMLgoodies_largeImage);
			DHTMLgoodies_largeImage = document.createElement('IMG');
			tmpParent.appendChild(DHTMLgoodies_largeImage);
			setOpacity();
			DHTMLgoodies_largeImage.src = DHTMLgoodies_imageToShow;
		
			speed=opacitySteps;
		}
		if(DHTMLgoodies_currentOpacity>=99 && speed>0){
			DHTMLgoodies_currentOpacity=99;
		}
		setOpacity();	
		if(DHTMLgoodies_currentOpacity>=99 && speed>0){
			return;	
			}
		if(uniqueId==currentUnqiueOpacityId){
			setTimeout('moveOpacity(' + speed + ',' + uniqueId + ')',opacitySpeed);
		}
	}
	
	function initGalleryScript()
	{
		passi = Math.ceil((numero_colonne - 4) / (step_immagini));
		leftArrowObj = document.getElementById('DHTMLgoodies_leftArrow');		
		leftArrowObj.style.visibility='hidden';
		rightArrowObj = document.getElementById('DHTMLgoodies_rightArrow');
		if(numero_colonne <= 4){
			rightArrowObj.style.visibility='hidden';
		}
		leftArrowObj.style.cursor = 'pointer';	
		rightArrowObj.style.cursor = 'pointer';	
		leftArrowObj.onclick = moveThumbnails;
		rightArrowObj.onclick = moveThumbnails;
		DHTMLgoodies_largeImage = document.getElementById('DHTMLgoodies_largeImage').getElementsByTagName('IMG')[0];
		var innerDiv = document.getElementById('DHTMLgoodies_thumbs_inner');
		DHTMLgoodies_slideWidth = (innerDiv.getElementsByTagName('DIV')[0].offsetWidth);//cambiato la prima volta
		DHTMLgoodies_thumbDiv = document.getElementById('DHTMLgoodies_thumbs_inner');
		DHTMLgoodies_thumbDiv.style.left = '0px';
		
		var subDivs = DHTMLgoodies_thumbDiv.getElementsByTagName('DIV');
		DHTMLgoodies_thumbTotalWidth = 0;
		var tmpLeft = 0;//cambiato ora, era 0
		for(var no=0;no<subDivs.length;no++){
			if(subDivs[no].className=='strip_of_thumbnails'){
				DHTMLgoodies_thumbTotalWidth = DHTMLgoodies_thumbTotalWidth + DHTMLgoodies_slideWidth;//aggiunto il +6
				subDivs[no].style.left = tmpLeft + 'px';
				subDivs[no].style.top = '0px';
				tmpLeft = tmpLeft + subDivs[no].offsetWidth;
			}
		}

		DHTMLgoodies_viewableWidth = document.getElementById('DHTMLgoodies_thumbs').offsetWidth;
		
		
		DHTMLgoodies_currentActiveImage = DHTMLgoodies_thumbDiv.getElementsByTagName('A')[0].getElementsByTagName('IMG')[0];
		DHTMLgoodies_currentActiveImage.className='activeImage';
	}