need help with execute immediate from a script

Im calling a script that uses dynamic sql. Im passing in a value as well. I keep getting

SP2-0552: Bind variable "2" not declared.

Here is a code snipped

declare
  v_var1 Varchar2(30) := 'TEST';
  v_var2 VARCHAR2(30) := '&1';
  total number;
begin

execute immediate ' Select * ' ||


                  ' from user_objects '||

                  ' where object_name = :1 '||

                  ' or object_name = :2 '||

                 using v_var1,v_var2
  into total;

end;
/

I call it as follows: Received on Mon Jul 21 2003 - 15:01:24 CDT