HOw to remove string;# from calculate look up column in datasheet view in sharepoint site?

 Hii All,
  I am using wss 3.0 and i have two sharepoint list. in one list i made a one calculate field like full name = first + last name.. and i used  as a look up column in another list. it works fine in standered view. But when i use Datasheet view then in drop down i get name like ..  " string;# Dipesh Patel " every name start with string;#. So i want to remove this things from drop down list.

And when i update any column from this list then i get error Name is not match with look up column. so every time i have to select look up column..

Let me know if you need more explanation..

Thanks
Dips

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Patel