Unable to log in to Admin

I am no longer able to log into my WordPress 2.6 blog.
I keep bumping up against the following, any insight?

Warning: Cannot modify header information – headers already sent by (output started at /home/micc8/public_html/wp-content/themes/illacrimo/functions.php:24) in /home/micc8/public_html/wp-login.php on line 267

Warning: Cannot modify header information – headers already sent by (output started at /home/micc8/public_html/wp-content/themes/illacrimo/functions.php:24) in /home/micc8/public_html/wp-login.php on line 279

Warning: Cannot modify header information – headers already sent by (output started at /home/micc8/public_html/wp-content/themes/illacrimo/functions.php:24) in /home/micc8/public_html/wp-includes/pluggable.php on line 595

Warning: Cannot modify header information – headers already sent by (output started at /home/micc8/public_html/wp-content/themes/illacrimo/functions.php:24) in /home/micc8/public_html/wp-includes/pluggable.php on line 596

Warning: Cannot modify header information – headers already sent by (output started at /home/micc8/public_html/wp-content/themes/illacrimo/functions.php:24) in /home/micc8/public_html/wp-includes/pluggable.php on line 597

Warning: Cannot modify header information – headers already sent by (output started at /home/micc8/public_html/wp-content/themes/illacrimo/functions.php:24) in /home/micc8/public_html/wp-content/plugins/ylsy_permalink_redirect.php on line 389

Thanks for any assistance with this. I have to get some sleep now, but I will check back tomorrow and see what next steps are possible.

Tim