Change the name of a customized attribute

Hi, 

How can I change the name of an attribute in a customized entity in CRM 4? i.e. the customized entity is "new_cust_entity" with a customized attribute "new_cust_attribute" type bit, and I want to change the attribute' name to "new_cust_attribute_name", everything else should remain the same including relationships.

Thanks in advance.