thanks for your reply
this would be a good idea but there is one problem. I wouldn't like to delete all incomplete files, but only some. if I deleted all of them, I'd need to search again for all the files I actually did want to download and this would take too much time, for I've quite a number of them.
therefore, I'd prefer to get rid of the selected files one by one...
do you happen to have any other solution in mind?