function eshop_change_picture (file_name){
	// base variables
	var http_path = 'https://www.fineantiquesprague.com/';
	var main_foto_img = http_path+'files/item/'+file_name+'_big.jpg';
	var orig_foto_img = http_path+'files/item/'+file_name+'_orig.jpg';
	var main_foto_link_zoom = http_path+'system/_includes/zoom/zoom.php?img='+file_name;

	// setting image souces
	$('#eshop_main_image').attr('src',main_foto_img);
	$('.eshop_item_download_link').attr('href',orig_foto_img);
	$('.eshop_item_zoom_link').attr('href',main_foto_link_zoom);

	// move to top
	moveto('bodytop');
}