There are three ways to enable auditing options within MOSS 2007 :
For a whole site collection:
In ‘Site Settings’ click on ‘Audit Settings’ or navigate tohttp://sitename/_layouts/auditsettings.aspx
Select the actions you want to audit and click OK.
For a particular document library:In ‘Document Library Settings’ : ‘Information management policy settings’Click to create a local policy and select Auditing and actions
For a particular content type:Create a content type and click on ‘Information management policy settings’Click to create a local policy and select Auditing and actions
To view the Audit Log Reports you have to activate the Reporting feature:Navigate to:http://sitename/_layouts/ManageFeatures.aspx?scope=SiteFind Reporting and click on ‘Activate’ (if not activated)Go to ‘Site Settings’ then you should see ‘Audit log reports’.You can click on the link and then you can select the report you would like to generate.