How to trim both side?

There are only LTRIM and RTRIM functions in T-SQL
But I want to trim both side.
How can I do?Use both
SELECT LTRIM(RTRIM(' this is a string with whitespace on both sides ')
Adam Machanic
Pro SQL Server 2005, available now
http://www.apress.com/book/bookDisplay.html?bID=457
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"ad" <flying@.wfes.tcc.edu.tw> wrote in message
news:uyfpTXTfGHA.4828@.TK2MSFTNGP05.phx.gbl...
> There are only LTRIM and RTRIM functions in T-SQL
> But I want to trim both side.
> How can I do?
>