function readOnly(count){ }
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We cannot change the Standard behavior,
You have to create a Visualforce page and customize / override the same.
See the below links,
Overriding an Existing Page with a Visualforce Page
https://www.salesforce.com/us/developer/docs/pages/Content/pages_quick_start_tabs.htm
Add Attachment page sample code
https://developer.salesforce.com/forums/ForumsMain?id=906F000000099PPIAY
Regards,
Ashish