JavaScript IE appendChild() - Unexpected call to method or property access

Question

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 so

Answer 1

For search results benefits - I had this same error in IE 6 and 7 "Unexpected call to method or property access" when appending a child node to a namespaced element, but the namespace hadn't been declared.

var a=document.createElement("foo:blah");
var b=document.createElement("div");
a.appendChild(b); //Fails

To get around this, I had to add the namespace declaration either into the HTML code:

or dynamically via javascript (Probably should be wrapped in try/catch):

var namespaces = document.namespaces;
if(namespaces) {
    namespaces.add("foo", null, null);
}