/*___________________________________________________________________________________________________________________

	mediaCT webinterieur - www.mediact.nl - info@mediact.nl - 050 5799393 - Groningen - The Netherlands
	copyright: http://creativecommons.org/licenses/by-nc-nd/2.0/deed.nl

_____________________________________________________________________________________________________________________*/

	var timer;
	var foldersHeight 	= 0;
	var changedHeight 	= 0;
	var foldersSpace	= 10;
	var folderImages 	= new Array();
	var move			= 'up';
	var speed			= 1;
	var imageSize       = 100;
	
	function loadedPage() {
		calculateScroll();
	}
	
	function calculateScroll() {
		imgObj 	= 'obj';
		i 		= 1;
		while(imgObj != null) {
			imgObj = document.getElementById('product_image_' + i);
			if(imgObj) folderImages.push(imageSize);
			i++;
		}
		
		for(i=0; i < folderImages.length; i++) {
			foldersHeight += folderImages[i];
			foldersHeight += foldersSpace;
		}
		
		if(foldersHeight > 0) {
			startScroll();
		}
	}
	
	function startScroll() {
		clearTimeout(timer);
		if($('#product_images').height() < $('#product_imageslist').height()){
			$('.navigation').remove();
		}
		if(document.getElementById('product_imageslist') && $('#product_images').height() > $('#product_imageslist').height()){
			foldersObj = document.getElementById('product_images');
			foldersBackupObj = document.getElementById('product_images_backup');

			if(move == 'up') {
				changedHeight += speed;
			} else {
				changedHeight -= speed;
			}
			
			if(changedHeight >= foldersHeight) changedHeight = 0;
			if(changedHeight < 0) changedHeight = foldersHeight;

			foldersObj.style.top = '-' + changedHeight + 'px';
			foldersBackupObj.style.top = '-' + changedHeight + 'px';

			timer = setTimeout('startScroll()',40);
		}
	}
	
	function stopScroll() {
		clearTimeout(timer);
	}