/***********************************************************************************************
	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=true;	// 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 = 'modules/mod_slidergallery/images/' + 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 = 'modules/mod_slidergallery/images/' + 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()
	{
		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();
	}