If you want to display the publish button without going through the Parallel Approval Workflow. Here is how:
1. Go to Modify Pages Library Settings.
2. Click Workflow settings
3. Click Parallel Approval.
4. Uncheck 'Start this workflow to approve publishing a major version of an item.'
5. Now that you are able to publish the page content without the approval workflow.
The Publish button is not displayed when you create a site that is based on the Publishing Portal site template in SharePoint Server 2007