Step 1 :
config.php and locate line:
$Config['ConfigAllowedCommands'] = array(‘QuickUpload’, ‘FileUpload’, ‘GetFolders’, ‘GetFoldersAndFiles’, ‘CreateFolder’) ;
just add function ‘DeleteFile’
Like this:
$Config['ConfigAllowedCommands'] = array(‘QuickUpload’, ‘FileUpload’, ‘GetFolders’, ‘GetFoldersAndFiles’, ‘CreateFolder’, ‘DeleteFile’) ;

Step 2:
Place the delete image into filemanager/browser/default/images

Step 3:

Open up filemanager/frmresourceslist.html for editing with your favorite text-editor
Create a Delete Link which will call the DeleteFile function (which we’ll create later)
Go to line #66 where you’ll find this:
JavaScript:
var sLink = ‘<a href=”#” onclick=”OpenFile(\” + fileUrl + ‘\’);return false;”>’ ;

Underneath that line, now insert this:
JavaScript:
var dLink = ‘<a href=”#” title=”Delete file” onclick=”DeleteFile(\” + escape(fileName) + ‘\’);return false;”>’ ;
Add the created Delete Link to the page
Go to line #75 (#74 if you haven’t added the Delete Link yet) where you’ll find this:

JavaScript:
oCell.innerHTML = sLink + ‘<img alt=”" src=”images/icons/’ + sIcon + ‘.gif” width=”16″ height=”16″ border=”0″></a>’ ;

Replace that line with:
JavaScript:
oCell.innerHTML = sLink + ‘<img alt=”" src=”images/icons/’ + sIcon + ‘.gif” width=”16″ height=”16″ border=”0″></a> ‘ +  dLink + ‘<img alt=”" src=”images/delete.gif” width=”16″ height=”16″ border=”0″></a>’ ;

Add a DeleteFile function (which will call the PHP script) and a DeleteFileCallBack function (which is called after the file was deleted) just before window.onload = { … }
The DeleteFile function:

JavaScript:
function DeleteFile( fileName, fileUrl ) {
if (confirm(‘Are you sure you wish to delete ‘ + unescape(fileName) + ‘?’)) {
oConnector.SendCommand( ‘DeleteFile’, “FileName=” + fileName, DeleteFileCallBack ) ;
}
}

The DeleteFileCallBack function
function DeleteFileCallBack ( fckXml ) {
var oNodes = fckXml.SelectNodes( ‘Connector/Error’ );
if (oNodes!=null && oNodes.length>0) {
var errNo = parseInt(oNodes[0].attributes.getNamedItem(‘number’).value) ;
switch (errNo) {
case 0 :
break;
case 102 :
case 103 :
alert(oNodes[0].attributes.getNamedItem(‘originalDescription’).value);
break;
default:
alert(‘DFi: Invalid XML response from connector..’);
}
} else {
alert(‘DFi: Invalid XML response from connector.’);
}
Refresh();
}

Step 4:
Open up filemanager/connectors/php/commands.php for editing at the very end of the file (just before the ?>)
Add a DeleteFile function which actually deletes the file
PHP:

function DeleteFile($resourceType, $currentFolder) {
$sErrorNumber = ’0′ ;
$sErrorMsg = ” ;
if ( isset( $_GET['FileName'] ) ) {
// Map the virtual path to the local server path.
$sServerDir = ServerMapFolder( $resourceType, $currentFolder ) ;
$sFileName = $_GET['FileName'] ;
if ( strpos( $sFileName, ‘..’ ) !== FALSE ) {
$sErrorNumber = ’102′ ; // Invalid file name.
$sErrorMsg = ‘Invalid file name’;
} else {
if ( @unlink($sServerDir.$sFileName) ) {
$sErrorNumber = ’0′ ; // deleted
} else {
$sErrorNumber = ’103′ ; // not deleted
$sErrorMsg = ‘Could not delete file ‘.$sServerDir.$sFileName;
}
}
} else {
$sErrorNumber = ’102′ ; // no file set
$sErrorMsg = ‘No file specified’;
}
// Create the “Error” node.
echo ‘<Error number=”‘ . $sErrorNumber . ‘” originalDescription=”‘ . ConvertToXmlAttribute( $sErrorMsg ) . ‘” />’ ;
}

Step 5:
Open up filemanager/connectors/php/connector.php for editing
Modify the switch statement to include the DeleteFile action
Go to line 100 where you’ll find “break ;”, after that add:
PHP:
case ‘DeleteFile’ : // Added by glad
DeleteFile( $sResourceType, $sCurrentFolder ) ;
break ;