As an addition to the Branding provided by liequ, you would be able to specify the Sign Out Page for your Customers and Sub-Resellers. Your Customers and Sub-Resellers would be re-directed to this particular page when they Sign Out from their Control Panel.
To specify your Sign Out URL for your Customers and Sub-Resellers
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Login to your Reseller Control Panel. See details
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Point to Settings and click Branding Settings.
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Click the Control Panel tab and then click the Sign Out URL link.
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Here you can specify separate Sign Out URLs for your Customers and Sub-Resellers.
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Click the Update button to submit the changes.