Handle the resizestop event:
http://docs.jquery.com/UI/Resizable#event-stop

Inside the stop callback, you can use $(this).width() and $(this).height()
or ui.size:

$('#myDiv').resizable({
  stop: function(event, ui) {
    var newWidth = $(this).width(), newHeight = $(this).height();
    //or
    var newWidth = ui.size.width, newHeight = ui.size.height;
  }
});

- Richard

On Sun, Aug 16, 2009 at 5:33 PM, webmas...@terradon.nl <
webmas...@terradon.nl> wrote:

>
> Hi all,
> i have a resizable (grid 50) div with a background image.
>
> When i resize, i want to change my background image, like:
> bg400.png for bg350.png.
>
> But how do i detect the new heigth/width and how do i replace the
> background image?
>
> Thanks in advance for any answer!
>
> >
>

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