两段demo代码如下(for ie only)：
//demo3( for firefox)
< HTML >
< HEAD >
< TITLE > 使firefox对xml的处理兼容IE的selectSingleNode selectNodes方法
< meta NAME ="Author" CONTENT ="emu" >
< meta NAME ="Keywords" CONTENT ="firefox IE selectSingleNode selectNodes" >
< meta NAME ="Description" CONTENT ="使firefox可以支持selectSingleNode selectNodes方法" >
< script LANGUAGE ="Javascript" >
< BODY >
//demo4( cross brower)
http://kb.mozillazine.org/XPath
