I've been working on some code for a contracting client which involves a really cool drag-n-drop interface for building forms on-the-fly. While working on the project, I ran into an issue in IE6 when dragging a <div /> element that form fields and there values had been changed by the user, the values were not properly reflected when I'd copy the node using the cloneNode() DOM method.
It turns out IE 6/7 doesn't properly clone some form elements when you use the cloneNode(true) and the form element is a checkbox, radio or select element. My suspicion is this is because MSIE stores the element in a non-XHTML way (if you do an innerHTML on the source element you'll see that checkbox elements have a "CHECKED" attribute with no value.)
I was able to work around the issue by doing the following: