php problem...i can not delete an empty directory...help me..?

[sHuVo]

i wrote this code:


$file_url=$_GET['file_url'];
$break=explode('/',$file_url);

$filepath = "$break[0]/$break[1]/$break[2]";


if($file_url != ''){
unlink("$file_url");
unlink ($filepath);

}




This segment of code can delete the file inside the $filepath directory... but it can not delete this $filepath directory... A message says
"Warning: unlink(upload/1/11 13 45 AM Tue, April 14th 2009) [function.unlink]: Permission denied in C:\xampp\htdocs\answerbd\ask.php on line 45 "

What can i do now...please help me....
i Also tried this...


$file_url=$_GET['file_url'];
$break=explode('/',$file_url);

$filepath = "$break[0]/$break[1]/$break[2]";


if($file_url != ''){
unlink("$file_url");
unlink ($filepath);

}



But no result..
i also tried this code:


$file_url=$_GET['file_url'];
$break=explode('/',$file_url);

$filepath = "$break[0]/$break[1]/$break[2]";


if($file_url != ''){
unlink("$file_url");
rmdir ($filepath);

}


no result...
i also tried this code:


$file_url=$_GET['file_url'];
$break=explode('/',$file_url);

$filepath = "$break[0]/$break[1]/$break[2]";


if($file_url != ''){
unlink("$file_url");
rmdir ($filepath);

}


no result...