Draggable + resizable + IE

Draggable + resizable + IE

Hi,
I currently use JQuery-1.3.2 with JQuery-UI-1.7.2.
I have a small div set as resizable + draggable, to draw a frame on an image to make a crop. Here is my code :
  1. $('#crop_box').css('left', curLeft)
  2.  .css('top', curTop)
  3.  .css('width', curWidth)
  4.  .css('height', curHeight)
  5.  .resizable({
  6.  containment: $('IMG', $img),
  7.  autoHide: true,
  8.  minWidth: 30,
  9.  minHeight: 30,
  10.  distance: 5,
  11.  stop: _setFormInputs
  12.  })
  13.  .draggable({
  14.  containment: $('IMG', $img),
  15.  cursor: 'move',
  16.  stop: _setFormInputs
  17.  });
Everything is OK on many browsers (tried avec Firefox, Chrome and Safari), except IE (I use IE7) : with it, I can resize the frame only one time horizontally and one time vertically ; after that, the box can be moved but not resized anymore...
Being an entreprise application, I can't actually switch to another release of JQuery/UI.

Any help or idea will be welcome...

Thanks,
Thierry