function chagePage(i,direction){
	if (direction){
		if (direction == 'prev' && (thumbPage-1)!=0){
			new Effect.Parallel(
				[ new Effect.Fade('thumbs_page_'+thumbPage), 
				  new Effect.Appear('thumbs_page_'+(thumbPage-1)) ]
			);			
			$('page_link_'+thumbPage).removeClassName('x');
			$('page_link_'+(thumbPage-1)).addClassName('x');
			thumbPage=thumbPage-1;
		}
		else if (direction == 'next' && (thumbPage+1)<=i ){
			new Effect.Parallel(
				[ new Effect.Fade('thumbs_page_'+thumbPage), 
				  new Effect.Appear('thumbs_page_'+(thumbPage+1)) ]
			);			
			$('page_link_'+thumbPage).removeClassName('x');
			$('page_link_'+(thumbPage+1)).addClassName('x');
			thumbPage=thumbPage+1;
		}
		else return;
	}
	else {
		new Effect.Parallel(
				[ new Effect.Fade('thumbs_page_'+thumbPage), 
				  new Effect.Appear('thumbs_page_'+(i+1)) ]
		);		
		$('page_link_'+thumbPage).removeClassName('x');
		$('page_link_'+(i+1)).addClassName('x');
		thumbPage=i+1;
	}
}

function loadImage(o){
	var imgT = $(o).firstDescendant();
	var src = imgT.src;
	
	var imgM = src.replace(/thumbs/, "medium");
	var imgL = src.replace(/thumbs/, "large");
	
	new Effect.Fade('medium_image',{ duration: 0.5, 
      afterFinish: function(effect) { $('medium_image').src = imgM; Effect.Appear('medium_image',{ duration: 0.5}); } 
    });
		
	$('large_link').href = imgL;
}