What were the error messages? Sometimes the problem is that the dump file is just too big to restore via a web browser.
If this is your problem, there is a great little script called Bigdump which can upload the file in successive sections. It might help.
Another way is to upload the dump file via FTP to a folder on your server and then import it directly from there. I'm not sure if this is possible on a shared hosting environment, as I have only done this on my own server.
Tim.