You need to replace _HOOK_ with the name of the function you’re using
Instead of
function _HOOK_() {
use:
function scripts() {
and also delete the indicated line: /* DELETE THIS LINE
And actually, since you’ve got a lot of single quote marks in there you’ll either need to escape them by placing a backslash \ in front of each one or use this alternative method for the script hook:
function scripts() {
echo <<<SCRIPT
....your code...
SCRIPT;
return false;
} // END /**/
more about that method here: