Automated template edit problem

[Harutyun Dr.]

Yes, i've seen that in temlatecache there is a such string, but replacement gives an error (my pages don't load completely after i've installed my plugin)
the code is:

$lookfor='".(($GLOBALS[\'vbulletin\']->options[\'enablememberlist\']) ? ("';
				$replace='some text'.$lookfor;
				$vbulletin->templatecache['navbar'] = str_replace($lookfor,  $replace, $vbulletin->templatecache['navbar']);

So why it doesn't work???