You have to write javascipt code to redirect to VF page standard custom button. Should use window.location function to redirect to VF page.
Example:
{!REQUIRESCRIPT('/soap/ajax/26.0/connection.js')} var accReq = "{!Account.Name}"; if(accReq != '') { window.location="/apex/VisualforceName?id={!Account.Id}"; } else { alert('Name is mandatory'); window.location.reload(); }
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