//if browser does not have node constants
if( !window.Node )
{
    var Node = {
        ELEMENT_NODE: 1,
        ATTRIBUTE_NODE: 2,
        TEXT_NODE: 3,
        CDATA_SECTION_NODE: 4,
        ENTITY_REFERENCE_NODE: 5,
        ENTITY_NODE: 6,
        PROCESSING_INSTRUCTION_NODE: 7,
        COMMENT_NODE: 8,
        DOCUMENT_NODE: 9,
        DOCUMENT_TYPE_NODE: 10,
        DOCUMENT_FRAGMENT_NODE: 11,
        NOTATION_NODE: 12
    }
}