function getTextContent(node) {
  return (node.textContent || node.innerText || node.text);
}

function getXmlTagValue(node, tag) {
  var children = node.getElementsByTagName(tag);
  if (children == null) return null;

  var child = children[0];
  if (child == null) return null;

  return getTextContent(child);
}

Array.prototype.contains = function(element) {
  for (var i = 0; i < this.length; i++) {
    if (this[i] == element) return true;
  }
  return false;
}

var Url = {
 
  // public method for url encoding
  encode : function (string) {
    return escape(this._utf8_encode(string));
  },
 
  // public method for url decoding
  decode : function (string) {
    return this._utf8_decode(unescape(string));
  },
 
  // private method for UTF-8 encoding
  _utf8_encode : function (string) {
    string = string.replace(/\r\n/g,"\n");
    var utftext = "";
 
    for (var n = 0; n < string.length; n++) {
 
      var c = string.charCodeAt(n);
 
      if (c < 128) {
        utftext += String.fromCharCode(c);
      }
      else if((c > 127) && (c < 2048)) {
        utftext += String.fromCharCode((c >> 6) | 192);
        utftext += String.fromCharCode((c & 63) | 128);
      }
      else {
        utftext += String.fromCharCode((c >> 12) | 224);
        utftext += String.fromCharCode(((c >> 6) & 63) | 128);
        utftext += String.fromCharCode((c & 63) | 128);
      }
 
    }
 
    return utftext;
  },
 
  // private method for UTF-8 decoding
  _utf8_decode : function (utftext) {
    var string = "";
    var i = 0;
    var c = c1 = c2 = 0;
 
    while ( i < utftext.length ) {
 
      c = utftext.charCodeAt(i);
 
      if (c < 128) {
        string += String.fromCharCode(c);
        i++;
      }
      else if((c > 191) && (c < 224)) {
        c2 = utftext.charCodeAt(i+1);
        string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
        i += 2;
      }
      else {
        c2 = utftext.charCodeAt(i+1);
        c3 = utftext.charCodeAt(i+2);
        string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
        i += 3;
      }
 
    }
 
    return string;
  },
 
  absolute : function (s) {
    var l = location, h, p, f, i; 
    if (/^\w+:/.test(s)) { 
      return s; 
    } 


    h = l.protocol + '//' + l.host; 
    if (s.indexOf('/') == 0) { 
      return h + s; 
    } 

    p = l.pathname.replace(/\/[^\/]*$/, ''); 
    f = s.match(/\.\.\//g); 
    if (f) { 
      s = s.substring(f.length * 3); 
      for (i = f.length; i--;) { 
        p = p.substring(0, p.lastIndexOf('/')); 
      } 
    } 


    return h + p + '/' + s; 
  }
}