how i can expand a page? And an error too

in this blog: http://www.bstefanou.gr/arthra/?p=96 i want the articles to take the whole width when its selected, not just to be in the middle of the page as is for now. how i can do it?

also for some days now im getting this error when im adding a new category:
Parse error: syntax error, unexpected $end in /home/bstefano/public_html/arthra/wp-admin/admin-ajax.php on line 589

on the lines 580-591 this is what i have:
`if ( $nonce_age == 2 ) {
$supplemental[‘replace-autosavenonce’] = wp_create_nonce(‘autosave’);
$supplemental[‘replace-getpermalinknonce’] = wp_create_nonce(‘getpermalink’);
$supplemental[‘replace-samplepermalinknonce’] = wp_create_nonce(‘samplepermalink’);
$supplemental[‘replace-closedpostboxesnonce’] = wp_create_nonce(‘closedpostboxes’);
if ( $id ) {
if ( $_POST[‘post_type’] == ‘post’ )
$supplemental[‘replace-_wpnonce’] = wp_create_nonce(‘update-post_’ . $id);
elseif ( $_POST[‘post_type’] == ‘page’ )
$supplemental[‘replace-_wpnonce’] = wp_create_nonce(‘update-page_’ . $id);
}
}`

i dont know if im responsible for the error because i have translate some words from some pages on my theme but those pages was on wp-content, and the admins page is wp-admin i should have that kind of problem right?