$("div#imagethumbs img").click(function(){
	
	var imagefile = $(this).attr("id");
	var imagefolder = $(this).attr("alt");
	
	if(imagefile)
		{
			$("#imageholder").html("<img src='image.php?img="+imagefile+"&sec="+imagefolder+"&mw=330&mh=&greyscale='>");
		}
});