public void book_borrowinfo(Member loginmem) throws Exception{
		// 뿩   ʴ´ٸ 
		if(bookcollect.findmybook(loginmem.ID) == -1){
			System.out.println("뿩  ϴ.");
			student_menu(loginmem);
		}else
			student_menu(loginmem);
	}