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 = '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 = '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()
{
  if(document.getElementById('arrow_left'))
  {
    document.getElementById('arrow_left').onmousemove = startSlide;
    document.getElementById('arrow_left').onmouseout = releaseSlide;
  }
    
  if(document.getElementById('arrow_right'))
  {
    
  document.getElementById('arrow_right').onmousemove = startSlide;
  document.getElementById('arrow_right').onmouseout = releaseSlide;
   }
		
  imageGalleryObj = document.getElementById('theImages');
  if(!imageGalleryObj)
    return;

  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){
		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;
		
	}
	function hideWaitMessageAndShowCaption(imageIndex)
	{
		document.getElementById('waitMessage').style.display='none';	
		//document.getElementById('largeImageCaption').innerHTML = imageGalleryCaptions[imageIndex];
		//document.getElementById('largeImageCaption').style.display='block';
		
	}
	*/
window.onload = initSlideShow;