/* Image functions */
/* Part of the script is based on a script from www.dhtmlgoodies.com, read copyrights below */

function setImage(imageSelect, id)
	{
		document.images['mainimage'].src = '../img/'+id+'/big/'+imageSelect;
	}
					
function showPrev(id)
	{
		if (document.form_img_select.imagearray.selectedIndex > 0 )
		{
			document.form_img_select.imagearray.selectedIndex = document.form_img_select.imagearray.selectedIndex - 1;
			document.images['mainimage'].src = '../img/'+document.form_img_select.imagearray.value;
		}
	}		
				
function showNext(id)
	{
		if (document.form_img_select.imagearray.selectedIndex + 1 < document.form_img_select.imagearray.options.length )
			{			
				document.form_img_select.imagearray.selectedIndex = document.form_img_select.imagearray.selectedIndex + 1;
				document.images['mainimage'].src = '../img/'+document.form_img_select.imagearray.value;
			}
	}
	
function getElementPosition(elemID) 
	{
		var offsetTrail = document.getElementById(elemID);
		var offsetLeft = 0;
		var offsetTop = 0;
		while (offsetTrail) {
		    offsetLeft += offsetTrail.offsetLeft;
		    offsetTop += offsetTrail.offsetTop;
		    offsetTrail = offsetTrail.offsetParent;
		}
		if (navigator.userAgent.indexOf("Mac") != -1 && 
		    typeof document.body.leftMargin != "undefined") {
		    offsetLeft += document.body.leftMargin;
		    offsetTop += document.body.topMargin;
		}
		return {left:offsetLeft, top:offsetTop};
	}

/************************************************************************************************************
(C) www.dhtmlgoodies.com, November 2005

This is a script from www.dhtmlgoodies.com. You will find this and a lot of other scripts at our website.	

Terms of use:
You are free to use this script as long as the copyright message is kept intact. However, you may not
redistribute, sell or repost it without our permission.

Thank you!

www.dhtmlgoodies.com
Alf Magne Kalleland

************************************************************************************************************/
	var arrowImageHeight = 35;	// Height of arrow image in pixels;
	var slideSpeed = 0;
	var previewImagePane = false;
	var slideEndMarker = false;
	var imageGalleryCaptions = new Array();
	function getTopPos(inputObj)
	{		
	
	  var returnValue = inputObj.offsetTop;
	  while((inputObj = inputObj.offsetParent) != null)returnValue += inputObj.offsetTop;
	  return returnValue;
	}
	
	function getLeftPos(inputObj)
	{

	  var returnValue = inputObj.offsetLeft;
	  while((inputObj = inputObj.offsetParent) != null)returnValue += inputObj.offsetLeft;
	  return returnValue;
	}

	function initSlide(e)
	{
		if(document.all)e = event;
		
		if(this.src.indexOf('over')<0)this.src = this.src.replace('.gif','-over.gif');
		
		slideSpeed = e.clientY + Math.max(document.body.scrollTop,document.documentElement.scrollTop) - getTopPos(this);
		if(this.src.indexOf('down')>=0){
			slideSpeed = (slideSpeed)*-1;	
		}else{
			slideSpeed = arrowImageHeight - slideSpeed;
		}
		slideSpeed = Math.round(slideSpeed * 10 / arrowImageHeight);
	}
	
	function stopSlide()
	{		
		slideSpeed = 0;
		this.src = this.src.replace('-over','');
	}
	
	function slidePreviewPane()
	{
		if(slideSpeed!=0){
			var topPos = previewImagePane.style.top.replace(/[^\-0-9]/g,'')/1;	
		
			if(slideSpeed<0 && slideEndMarker.offsetTop<(previewImageParent.offsetHeight - topPos)){
				slideSpeed=0;
			
			}
			topPos = topPos + slideSpeed;
			if(topPos>0)topPos=0;
		 	previewImagePane.style.top = topPos + 'px';
	 	
		}
	 	setTimeout('slidePreviewPane()',30);		
	}
	
	function revealThumbnail()
	{
		this.style.filter = 'alpha(opacity=100)';
		this.style.opacity = 1;
	}
	
	function hideThumbnail()
	{
		this.style.filter = 'alpha(opacity=70)';
		this.style.opacity = 0.7;
	}
	
	function initGalleryScript(elemID)
	{
		previewImageParent = document.getElementById('theImages');
		previewImagePane = document.getElementById('theImages').getElementsByTagName('DIV')[0];
		previewImagePane.style.top = '0px';
		var images = previewImagePane.getElementsByTagName('IMG');
		for(var no=0;no<images.length;no++){
			images[no].onmouseover = revealThumbnail;
			images[no].onmouseout = hideThumbnail;
		}	
		slideEndMarker = document.getElementById('slideEnd');
		
		document.getElementById('arrow_up_image').onmousemove = initSlide;
		document.getElementById('arrow_up_image').onmouseout = stopSlide;
		
		document.getElementById('arrow_down_image').onmousemove = initSlide;
		document.getElementById('arrow_down_image').onmouseout = stopSlide;

		slidePreviewPane();
		iniPos = getElementPosition(elemID).top - 165;
		previewImagePane.style.top = "-"+iniPos+ "px";
	}