@yoligim,
have you added this above the code you past here form/in set.js ??
PHP Code:
{separator:'---------------' },
{name:'Left', openWith:'[left]', closeWith:'[/left]', className:'Left'},
{name:'Center', openWith:'[center]', closeWith:'[/center]', className:'center'},
{name:'Right', openWith:'[right]', closeWith:'[/right]', className:'Right'},