$().ready(function(){

var thumbs = $('.gallery_thumbs a');
var pl = $('#placeholder');
thumbs.click(function(){
	var desc = $(this).find('img').attr('alt');
	var descCont = $('#img_desc');
	pl.attr('src',$(this).attr('href'));
	descCont.text(desc);
	thumbs.removeClass('active');
	$(this).addClass('active');
	return false;
	});

}); //end ready