[] operator not supported for strings

Hi Can anyone tell me why i'm getting this error? Fatal error: [] operator not supported for strings in c:\inetpub\wwwroot\Iweb-sites\Exp\menu2.php on line 41 [code]: $rst2=sql_call("SELECT * FROM tmenu WHERE parent=".$r['id']); // now have array of corporate, entertainment and identity for ($i=0; $i < mysql_num_rows($rst2); $i++) { $r=mysql_fetch_array($rst2); $level2[$i] = $r['name']; $rst3 = sql_call("SELECT * FROM tmenu WHERE parent=".$r['id']); while ($a=mysql_fetch_array($rst3)) { $level2[$i][] = $a['name']; // giving error here } } [/code] Regards Andrew McCombe Interactive Web Solutions (Stafford) Tel: 01785 279921 ----------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachments are confidential and may be legally privileged. If you have received this e-mail and you are not a named addressee, please inform us as soon as possible on +44 (0) 1785 279920 and then delete the e-mail from your system. If you are not a named addressee you must not copy, use, disclose, distribute, print or rely on this e-mail. Any views expressed in this e-mail or any attachments may not necessarily reflect those of Interactive Web Solutions' management. Although we routinely screen for viruses, addressees should scan this e-mail and any attachments for viruses. Interactive Web Solutions makes no representation or warranty as to the absence of viruses in this e-mail or any attachments. Please note that for the protection of our business, we may monitor and read e-mails sent to and from our server(s).