Parse error: syntax error, unexpected T_DOUBLE_ARROW

Parse error: syntax error, unexpected T_DOUBLE_ARROW in /home/content/d/e/r/derigo/html/redxband/wp-content/themes/xmark/functions.php on line 26\

I am helping a friend out and logged into admin page for our site and changed the template, everything was OK, til I refreshed and now I get this error trying to go to the site and the admin site. I have downloaded wordpress, mySQL and have dream weaver on my computer. I do not have the original files as I am not the one who originally set the site up, someone else did, who is no longer around. I need to know how I can set the template back to the original one without being able to pull up the site to be able to log in. I am at a lost at this point. Any help would be appreciated.