/***********************************************************************************************
	
	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 IS_displayWaitMessage=true;	// Display a please wait message while images are loading?
  	
   		
	var IS_activeImage = false;
	var IS_imageGalleryLeftPos = false;
	var IS_imageGalleryWidth = false;
	var IS_imageGalleryObj = false;
	var IS_maxGalleryXPos = false;
	var IS_slideSpeed = 0;
	var IS_imageGalleryCaptions = new Array();

	function IS_startSlide(e)
	{
		if(document.all)e = event;
		var id = this.id;
		this.getElementsByTagName('IMG')[0].src = 'images/' + this.id + '_over.gif';	
		if(this.id=='arrow_right'){
			IS_slideSpeedMultiply = Math.floor((e.clientX - this.offsetLeft) / 5);
			IS_slideSpeed = -1*IS_slideSpeedMultiply;
			IS_slideSpeed = Math.max(-10,IS_slideSpeed);
		}else{			
			IS_slideSpeedMultiply = 10 - Math.floor((e.clientX - this.offsetLeft) / 5);
			IS_slideSpeed = 1*IS_slideSpeedMultiply;
			IS_slideSpeed = Math.min(10,IS_slideSpeed);
			if(IS_slideSpeed<0)IS_slideSpeed=10;
		}
	}
	
	function IS_releaseSlide()
	{
		var id = this.id;
		this.getElementsByTagName('IMG')[0].src = 'images/' + this.id + '.gif';
		IS_slideSpeed=0;
	}
		
	function IS_gallerySlide()
	{
		if(IS_slideSpeed!=0){
			var leftPos = IS_imageGalleryObj.offsetLeft;
			leftPos = leftPos/1 + IS_slideSpeed;
			if(leftPos>IS_maxGalleryXPos){
				leftPos = IS_maxGalleryXPos;
				IS_slideSpeed = 0;
				
			}
			if(leftPos<IS_minGalleryXPos){
				leftPos = IS_minGalleryXPos;
				IS_slideSpeed=0;
			}
			
			IS_imageGalleryObj.style.left = leftPos + 'px';
		}
		setTimeout('IS_gallerySlide()',20);
		
	}
	
	function IS_showImage()
	{
		if(IS_activeImage){
			IS_activeImage.style.filter = 'alpha(opacity=50)';	
			IS_activeImage.style.opacity = 0.5;
		}	
		this.style.filter = 'alpha(opacity=100)';
		this.style.opacity = 1;	
		IS_activeImage = this;	
	}
	
	function IS_initSlideShow()
	{
		document.getElementById('arrow_left').onmousemove = IS_startSlide;
		document.getElementById('arrow_left').onmouseout = IS_releaseSlide;
		document.getElementById('arrow_right').onmousemove = IS_startSlide;
		document.getElementById('arrow_right').onmouseout = IS_releaseSlide;
		
		IS_imageGalleryObj = document.getElementById('theImages');
		IS_imageGalleryLeftPos = IS_imageGalleryObj.offsetLeft;
		IS_imageGalleryWidth = document.getElementById('galleryContainer').offsetWidth - 80;
		IS_maxGalleryXPos = IS_imageGalleryObj.offsetLeft; 
		IS_minGalleryXPos = IS_imageGalleryWidth - document.getElementById('slideEnd').offsetLeft;
		var slideshowImages = IS_imageGalleryObj.getElementsByTagName('IMG');
		for(var no=0;no<slideshowImages.length;no++){
			slideshowImages[no].onmouseover = IS_showImage;
		}
		
		var divs = IS_imageGalleryObj.getElementsByTagName('DIV');
		for(var no=0;no<divs.length;no++){
			if(divs[no].className=='imageCaption')IS_imageGalleryCaptions[IS_imageGalleryCaptions.length] = divs[no].innerHTML;
		}
		IS_gallerySlide();
	}
	
	function IS_showPreview(imagePath,imageIndex){
		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(IS_displayWaitMessage){
			document.getElementById('waitMessage').style.display='inline';
		}
		document.getElementById('largeImageCaption').style.display='none';
		img.onload = function() { IS_hideWaitMessageAndShowCaption(imageIndex-1); };
		img.src = imagePath;
		
	}
	function IS_hideWaitMessageAndShowCaption(imageIndex)
	{
		document.getElementById('waitMessage').style.display='none';	
		document.getElementById('largeImageCaption').innerHTML = IS_imageGalleryCaptions[imageIndex];
		document.getElementById('largeImageCaption').style.display='block';
		
	}
	window.onload = IS_initSlideShow;