children | NN n/a IE 4 DOM n/a
A collection of all elements contained in the current element. Collection members are sorted in source code order. Internet Explorer lets you use array notation or parentheses to access a single element in the collection.
Object Model Reference
IE | document.all.elementID.children(i) document.all.elementID.children[i]

length | NN n/a IE 4 DOM n/a
| Read-only
Returns the number of elements in the collection.
Example
    var howMany = document.body.children.length
Value Integer.