Filemanager - showing "thumbs" - Code not working

I tried to change the filemanager a bit, so it shows little pictures, so ppl using the filemanager can see the pictures actual display.

so i went and modified the file:

fckeditor\editor\filemanager\browser\default\frmresourceslist.html

oListManager.GetFileRowHtml = function( fileName, fileUrl, fileSize )
{
   // Build the link to view the folder.
   var sLink = '<a href="#" onclick="OpenFile(\'' + ProtectPath( fileUrl ) + '\');return false;">' ;

   If (fileSize < 100) {
   return '<tr><td width="16">' + sLink + '<img alt="" src="/images/upload/Image' + fileName + '" width="100" height="75" border="0"><\/a>' +
         '<\/td><td>&nbsp;' + sLink + fileName + '<\/a>' +
         '<\/td><td align="right" nowrap>&nbsp;' + fileSize + ' KB' +
         '<\/td><\/tr>' ;
   }
   else {
   // Get the file icon.
   var sIcon = oIcons.GetIcon( fileName ) ;
   return '<tr><td width="16">' + sLink + '<img alt="" src="images/icons/' + sIcon + '.gif" width="16" height="16" border="0"><\/a>' +
         '<\/td><td>&nbsp;' + sLink + fileName + '<\/a>' +
         '<\/td><td align="right" nowrap>&nbsp;' + fileSize + ' KB' +
         '<\/td><\/tr>' ;
   }
}

It should show images that are smaller then 100kb, but it isn't working... I also think it need an extension check... anyway it's in the pictures folder so I guess it won't show any other files as pictures :roll:

please help!

P.S.
I am a JavaScript n00b