Crashed site, & wp-admin login disabled, after a functions.php file mistake

My business website’s theme is Twenty Eleven, and I accidentally deleted the final lines from functions.php (lines #712-729).

Unfortunately, when I tried to re-enter the missing lines I got the following message:

Parse error: syntax error, unexpected $end in /hermes/bosweb26b/b2351/ipg.tacticalflexibilityc/wp-content/themes/twentyeleven/functions.php on line 604

As a result, I am now not even able to login to my dashboard tacticalflexibility/wp-admin/ – so both the website is crashed and my login abilities as well.

In retrospect, it looks like I should have created a Child Theme to solve my sidebar issues, but regrettably once the missing elements were updated I became unable to do anything.

I can find the original html codes here, but won’t be able to incert it until the login issue is solved first.

Any help would be much appreciated, Neal