Every reseller (including "serveradmin") has an ability to setup his own branded parking page that will be placed to the root of newly created web sites.
To setup a parking page page for new web sites login under reseller account:
Click on "Policies" link located in "Settings" section on the right side:
Click "WEB Policy" link to open web policies.
In "Parking Page" section:
Add Parking Page - tick this checkbox if parking page should be added to all new web sites.
Page Name - Specify file name of the parking page. Make sure this name exists in the list of default web site documents ("Default Documents" section below).
Page Content - Place arbitrary HTML content for the parking page.