(no version information, might be only in CVS)
DOMNode->insertBefore() -- Adds a new child before a reference nodeThis function inserts a new node right before the reference node. If you plan to do further modifications on the appended child you must use the returned node.
newnodeThe new node.
refnode
The reference node. If not supplied, newnode is
appended to the children.
Raised if this node is readonly or if the previous parent of the node being inserted is readonly.
Raised if this node is of a type that does not allow children of the
type of the newnode node, or if the node to
append is one of this node's ancestors or this node itself.
Raised if newnode was created from a different
document than the one that created this node.
Raised if refnode is not a child of this node.