jQuery offsetParent - using with drag/drop UI problem in IE7

jQuery offsetParent - using with drag/drop UI problem in IE7


hi all,
this problem is driving me nuts! i hope to be able to provide as much
info as possible to help resolve it!! the site is working fine with
the drag n drop, but at some points the drag feature breaks reporting
an error with line number 3370 (or there abouts as i have added a
couple of lines to try n debug)...the line number points to this line
of code...
offsetParent = elem.offsetParent,
it reports and error in IE with the script debugger...i have tried
logging the elem to the console and it works fine, but for some reason
it breaks when trying to get the offsetParent and ownerDocument from
the draggable element.
any help would be most gratefully appreciated!!! i can supply a URL to
view the issue...the site works fien in FF otherwise i'd be using
firefbug to track down the problem...i can't seem to extract any more
info than this really...!
again thanks in advance!!
tom