[jQuery] Set Div Width

[SamCKayak]

I'm setting the width of a DIV using:

...).children('div').attr( {width: ('80px'} );

It seems to have no effect (I have margin:0 auto; set in CSS).

The rendered (view/generated source) shows:

<div width="80">

which isn't what I had expected.  I know that:

<div style="width:80px">

will work fine.

Is there a better way to set the width of a block element?

Sam