function walkChildNodes(objRef, n) {
    var obj
    if (objRef) {
        if (typeof objRef == "string") {
            obj = document.getElementById(objRef)
        } else {
            obj = objRef
        }
    } else {
        obj = (document.body.parentElement) ? 
            document.body.parentElement : document.body.parentNode
    }
    var output = ""
    var indent = ""
    var i, group, txt
    if (n) {
        for (i = 0; i < n; i++) {
            indent += "+---"
        }
    } else {
        n = 0
        output += "Węzły podrzędne węzła <" + obj.tagName 
        output += ">\n=====================\n"
    }
    group = obj.childNodes
    for (i = 0; i < group.length; i++) {
        output += indent
        switch (group[i].nodeType) {
            case 1:
                output += "<" + group[i].tagName
                output += (group[i].id) ? " ID=" + group[i].id : ""
                output += (group[i].name) ? " NAME=" + group[i].name : ""
                output += ">\n"
                break
            case 3:
                txt = group[i].nodeValue.substr(0,15)
                output += "[Tekst:\"" + txt.replace(/[\r\n]/g,"<cr>")
                if (group[i].nodeValue.length > 15) {
                    output += "..."
                }
                output += "\"]\n"
                break
            case 8:
                output += "[!COMMENT!]\n"
                break
            default:
                output += "[Typ węzła = " + group[i].nodeType + "]\n"
        }
        if (group[i].childNodes.length > 0) {
            output += walkChildNodes(group[i], n+1)
        }
    }
    return output
}
