[Koha] Hello to All

Hello All! I m new to this mailing list but administrating koha for more than a year i want to put a .swf file in the main opac page I set a video and put its object in the opac main block via system global preferences but it only show the blank video outline i.e. the video is not loaded at all if i try to place any image it is also not shown there can any body help me what am i missing what could be the place to put video or image or what could be the absolute path for any place.