/***********************************************************************************************
	
	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 displayWaitMessage=false;	// Display a please wait message while images are loading?
  	
   		
	var activeImage = false;
	var imageGalleryLeftPos = false;
	var imageGalleryWidth = false;
	var imageGalleryObj = false;
	var maxGalleryXPos = false;
	var slideSpeed = 0;
	var imageGalleryCaptions = new Array();
	function startSlide(e)
	{
		if(document.all)e = event;
		var id = this.id;
		this.getElementsByTagName('IMG')[0].src = sliderImagesRootFolder+'' + this.id + '_over.gif';	
		if(this.id=='arrow_right'){
			slideSpeedMultiply = Math.floor((e.clientX - this.offsetLeft) / 5);
			slideSpeed = -1*slideSpeedMultiply;
			slideSpeed = Math.max(-10,slideSpeed);
		}else{			
			slideSpeedMultiply = 10 - Math.floor((e.clientX - this.offsetLeft) / 5);
			slideSpeed = 1*slideSpeedMultiply;
			slideSpeed = Math.min(10,slideSpeed);
			if(slideSpeed<0)slideSpeed=10;
		}
	}
	
	function releaseSlide()
	{
		var id = this.id;
		this.getElementsByTagName('IMG')[0].src =sliderImagesRootFolder+ '' + 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 showImage()
	{
		if(activeImage){
			activeImage.style.filter = 'alpha(opacity=50)';	
			activeImage.style.opacity = 0.5;
		}	
		this.style.filter = 'alpha(opacity=100)';
		this.style.opacity = 1;	
		activeImage = this;	
	}
	
	function initSlideShow()
	{
	
		// check if slider exist , if not exit the function
		if (document.getElementById('arrow_left') != null)
		{
		
		
			document.getElementById('arrow_left').onmousemove = startSlide;
			document.getElementById('arrow_left').onmouseout = releaseSlide;
			document.getElementById('arrow_right').onmousemove = startSlide;
			document.getElementById('arrow_right').onmouseout = releaseSlide;
			
			imageGalleryObj = document.getElementById('theImages');
			imageGalleryLeftPos = imageGalleryObj.offsetLeft;
			imageGalleryWidth = document.getElementById('galleryContainer').offsetWidth - 80;
			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 = showImage;
			}
			
		//	var divs = imageGalleryObj.getElementsByTagName('DIV');
		//	for(var no=0;no<divs.length;no++){
		//		if(divs[no].className=='imageCaption')imageGalleryCaptions[imageGalleryCaptions.length] = divs[no].innerHTML;
		//	}
			gallerySlide();
		}
	}
	
	function showPreview(imagePath,imageIndex,largeimagepath){
		var subImages = document.getElementById('previewPane').getElementsByTagName('IMG');
		if(subImages.length==0){
			var img = document.createElement('IMG');
			document.getElementById('previewPane').appendChild(img);
		}else img = subImages[0];
		
		if(displayWaitMessage){
			document.getElementById('waitMessage').style.display='inline';
		}
		//document.getElementById('largeImageCaption').style.display='none';
		//img.onload = function() { hideWaitMessageAndShowCaption(imageIndex-1); };
		img.src = imagePath;
		
		// only if LargeSize exist
		if (largeimagepath!="")	
		{
			img.alt='Click to enlarge';		
			img.style.cursor='pointer';
			img.onclick = function() {OpenImageWindow(largeimagepath);}
			
			// use the img for says click to enlarge 
			var zoomImage = document.getElementById('zoomIMG');
			zoomImage.style.cursor='pointer';
			zoomImage.onclick = function() {OpenImageWindow(largeimagepath);}
			
			
			
		}	
		else		
		{
			
			img.alt='';		
			img.style.cursor='default';
			img.onclick = 'true';
			
			// use the img for says click to enlarge 
			var zoomImage = document.getElementById('zoomIMG');			
			zoomImage.style.cursor='default';
			zoomImage.onclick = 'true';
		}
	
		
		
		
	}
	function hideWaitMessageAndShowCaption(imageIndex)
	{
		//document.getElementById('waitMessage').style.display='none';	
		//document.getElementById('largeImageCaption').innerHTML = imageGalleryCaptions[imageIndex];
		//document.getElementById('largeImageCaption').style.display='block';
		
	}
	function addLoadEvent(func) 
	{
    		var oldonload = window.onload;
    		if (typeof window.onload != 'function') 
    		{
    			window.onload = func;
    		} 
    		else 
    		{
    			window.onload = function() 
    		{
      			if (oldonload) 
      			{
        			oldonload();
        		}
      			func();
	    		}
	  	}
	}

	// add the load event to the exisitng on load 
	addLoadEvent(initSlideShow);
//	window.onload = initSlideShow;