Fields name in Sybase

Hi everybody:

I hope than you can help me in this problem..

I need make a select from a table in Sybase but the select field must be a variable...for example:

declare @field1 varchar(20)
select @field1 = "ID"
select @field1 from clients
/* recovering the field ID for all rows in table clients */

It is possible something like that?

Thanks

Regards

Elfhelm

PD: Sorry by my poor English