The Mysterious CRM Lookup

crmForm.all.regardingobjectid.DataValue[0].id; // The GUID of the lookup.

crmForm.all.regardingobjectid.DataValue[0].name; // The text value of the lookup.

crmForm.all.regardingobjectid.DataValue[0].typename; // The entity type name.

http://jianwang.blogspot.com/2008/05/mysterious-crm-lookup-i.html