[jQuery] how insert (prev) id into .before statement?

[Dmitriy Chipiga]

Hi,

I have a field
<input id=123 type=text>

and want to get
<input type=hidden value=myid><input id=myid type=text>


so I can't realize how to get id  and add it to "before" statement.
something like
$("input:text").before("<input type=hidden value= >")   ??