How to add a <tbody> to the beginning of <table> with jQuery?

Question

<table id="tab">
<tbody>
...
</tbody>
</table>

Likve above,there is already <tbody> inside <table>, $.append will make it to the end of <table>,how to make it to the beginning?

EDIT

I need to add a callback once new added <tbody> is in DOM,how?

Answer 1

Try the following:

$("#tab tbody:first").before("<tbody>Your text here</tbody>");

Answer 2

uh .. $.prepend() ?