SharePoint文档库自定义文档视图

I have a document library in MOSS 2007 which has folders and files. Document View in the document library has the following columns: document name, type, Created datetime, created by,modified datetime. How to configure the view so that it doesn't show any information for "modified", "created" and "created by" fields for folders. In other words,I want those fields to be empty for "folder" content types in document library document listing. Thanks in advance.I have a document library in MOSS 2007 which ha