Are the Frontpage extensions installed on your site? You can reinstall them in cPanel or you can open a ticket with the Help Desk and they can look into it for you.
Log into your cPanel. In the left sidebar your Home Directory path is displayed. Most servers are set up /home/cpanelname
And when entering an absolute path there is no http://
The advantage of using relative paths is you can move it from folder to folder or host to host and you wouldn't have to change anything. With absolute paths, if your home path changes you need to modify your code.