using the Archive_Tar

Hello, I want to use PEAR to use the tar command in the Archive_tar. So I have a file in /path/essaitar.php <?php // include class require("Tar.php"); // create Archive_Tar() object // specify filename for output file $tar = new Archive_Tar("data.tar"); // set up file list $files = array("/var/www/index.html","/var/www/pear.conf"); // build archive $tar->create($files) or die("Don't work"); ?> And the browser when i launch the php file say: Don't work I don't understand because the index.html exist and the pear.conf also exist. Another question: The php file is in the directory /path. So it will create the data.tar in the /path and if i want to create relative path, i start in the directoty path? for example, in the directoty path/, I have two files: toto.html and titi.html I want to create an archive of these two files: so I can use : $files = array("toto.html","titi.html"); or I have to use absolute path: $files = array("/path/toto.html","/path/titi.html"); ? Please help me... and sorry for my bad english ;-) Romain Valette