private static String getImageThunb(Element work) throws Exception{
		try{
			Elements tmp = work.getElementsByClass("work_thumb");
			if(tmp==null || tmp.size()==0) return "http://www.dlsite.com/images/web/home/no_img_sam.gif";
			Element thumb = tmp.get(0).child(0);
			Elements tmp1 = thumb.getElementsByTag("img");
			if(tmp1==null) return "http://www.dlsite.com/images/web/home/no_img_sam.gif";
	    	//thumbnail url
	    	String img = tmp1.get(0).attr("src") ;
	    	if("/images/web/home/no_img_sam.gif".equals(img)){
	    		return "http://www.dlsite.com/images/web/home/no_img_sam.gif";
	    	}
	    	return "http:"+img;
		}catch(Exception e){
			throw new Exception(e);
		}
	}