if(util==null) var util = {};

if (document.getElementById) {
  util.byId = function() {
    var elements = new Array();
    for (var i = 0; i < arguments.length; i++) {
      var element = arguments[i];
      if (typeof element == 'string') {
        element = document.getElementById(element);
      }
      if (arguments.length == 1) {
        return element;
      }
      elements.push(element);
    }
    return elements;
  };
}
else if (document.all) {
  util.byId = function() {
    var elements = new Array();
    for (var i = 0; i < arguments.length; i++) {
      var element = arguments[i];
      if (typeof element == 'string') {
        element = document.all[element];
      }
      if (arguments.length == 1) {
        return element;
      }
      elements.push(element);
    }
    return elements;
  };
}

var $$;
if (!$$) {
  $$ = util.byId;
}

util.removeAllRows = function(ele, options) {
  ele = util._getElementById(ele, "removeAllRows()");
  if (ele == null) return;
  if (!options) options = {};
  if (!options.filter) options.filter = function() { return true; };
  if (!util._isHTMLElement(ele, ["table", "tbody", "thead", "tfoot"])) {
    return;
  }
  var child = ele.firstChild;
  var next;
  while (child != null) {
    next = child.nextSibling;
    if (options.filter(child)) {
      ele.removeChild(child);
    }
    child = next;
  }
}

util._isHTMLElement = function(ele, nodeName) {
  if (ele == null || typeof ele != "object" || ele.nodeName == null) {
    return false;
  }
  if (nodeName != null) {
    var test = ele.nodeName.toLowerCase();
    if (typeof nodeName == "string") {
      return test == nodeName.toLowerCase();
    }
    if (util._isArray(nodeName)) {
      var match = false;
      for (var i = 0; i < nodeName.length && !match; i++) {
        if (test == nodeName[i].toLowerCase()) {
          match =  true;
        }
      }
      return match;
    }
    return false;
  }
  return true;
}

util.cloneNode = function(ele, options) {
  ele = util._getElementById(ele, "cloneNode()");
  if (ele == null) return null;
  if (options == null) options = {};
  var clone = ele.cloneNode(true);
  if (options.idPrefix || options.idSuffix) {
    util._updateIds(clone, options);
  }
  else {
    util._removeIds(clone);
  }
  ele.parentNode.insertBefore(clone, ele);
  return clone;
}

util._updateIds = function(ele, options) {
  if (options == null) options = {};
  if (ele.id) {
    ele.setAttribute("id", (options.idPrefix || "") + ele.id + (options.idSuffix || ""));
  }
  var children = ele.childNodes;
  for (var i = 0; i < children.length; i++) {
    var child = children.item(i);
    if (child.nodeType == 1 /*Node.ELEMENT_NODE*/) {
      util._updateIds(child, options);
    }
  }
}

util._removeIds = function(ele) {
  if (ele.id) ele.removeAttribute("id");
  var children = ele.childNodes;
  for (var i = 0; i < children.length; i++) {
    var child = children.item(i);
    if (child.nodeType == 1 /*Node.ELEMENT_NODE*/) {
      util._removeIds(child);
    }
  }
}

util._getElementById = function(ele, source) {
  var orig = ele;
  ele = util.byId(ele);
  if (ele == null) {
    return ele;
  }
  return ele;
}

util._isArray = function(data) {
  return (data && data instanceof Array);
}