set get featured image to large size

http://codex.wordpress.org/Function_Reference/get_the_post_thumbnail
error fix

Parse error: syntax error, unexpected ',' in
/home/mattwfry/public_html/wp-content/themes/pilot-fish/includes/scripts
.php on line 78
set get featured image to medium size

to avoid 100% issue
medium not large enough
remove rounded corners and bottom border