/***********************************************************************************************

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 activeImage = false;
var imageGalleryLeftPos = false;
var imageGalleryWidth = false;
var imageGalleryObj = false;
var maxGalleryXPos = false;
var slideSpeed = 0;
var imageGalleryCaptions = new Array();
var imgPath='includes/slideshow/';

function startSlide(e)
{
	if(document.all)e = event;
	var id = this.id;
	this.getElementsByTagName('IMG')[0].src = imgPath + '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 = imgPath + '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;
	}
	gallerySlide();
}
window.onload = initSlideShow;