I have been having this problem in IE. I have two divs which I use to drag selected elements from one to another. Lets say I have a child element (also a div) in div1 and some child elements in div2. I call the div2.appendChild() method on child element of div1. It removes the child from div1 and appends it to div2. If I then try to append the child back to div1 I get the following exception Unexpected call to method or property access in IE. It is working perfectly in firefox. See below code snippet for the javascript.

function moveSelectedGroupBoxItems(toLocation, grp){

    document.body.className = 'groupBoxDefaultCursor';

    if(groupBoxfromLocation != toLocation){

        if(grp == groupBoxGroup){

            var fromVal = document.getElementById(groupBoxfromLocation);

            var toVal = document.getElementById(toLocation);



            var children = fromVal.childNodes;

            for (var i = children.length - 1; i >= 0; i--) {

                if(children[i].className == 'groupBoxItemSelected'){

                    children[i].childNodes[0].name=toLocation;

                    toVal.appendChild(children[i]);

                }

            }

        }

    }

    groupBoxfromLocation = '';

    groupBoxGroup = '';

    return false;

}

This basically moves the selected child divs from one parent div to another on dragging.