how to add a where clause by parameter in a stored procedure

What i want is to add by parameter a Where clause and i can not find how to do it!
CREATE PROCEDURE [ProcNavigate]
(
@.id as int,
@.whereClause as char(100)
)
AS
Select field1, field2 from table1 Where fieldId = @.id /*and @.WhereClause */
GO
any suggestion?What you're trying to do can only be done using dynamic SQL. Dynamic SQL is a pretty large topic, so here are a few links to get youstarted:
http://www.databasejournal.com/features/mssql/article.php/1438931
http://www.sqlteam.com/item.asp?ItemID=4599
http://www.sommarskog.se/dynamic_sql.html