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  // start at elem, walk nav_property until find any of wanted_classes
  navigateDom: function (elem, navigation_property,
                         wanted_classes, stop_condition) {
    while (elem){
       if (stop_condition && stop_condition(elem)) break;
       if (elem.nodeType == 1 &&
           Element.hasAnyClass(elem, wanted_classes))
         return $(elem);
       // else walk to next element
       elem = elem[navigation_property];
     }
     return null;
  },


  autoScroll: function(elem, container, percentage) {
    percentage = percentage || 20; // default
    container  = container  || elem.offsetParent;

    var offset = elem.offsetTop;
    var firstElementChild = container.firstElementChild
                          || $(container).firstDescendant();

    if (firstElementChild) {
      var first_child_offset = firstElementChild.offsetTop;
      if (first_child_offset == container.offsetTop)
        offset -= first_child_offset;
    }

    var min = offset - (container.clientHeight * (100-percentage)/100);
    var max = offset - (container.clientHeight * percentage/100);

    if      (container.scrollTop < min) container.scrollTop = min;
    else if (container.scrollTop > max) container.scrollTop = max;
  },

  outerHTML: function(elem) {
    var tag = elem.tagName;
    if (!tag)
      return elem;           // not an element node
    if (elem.outerHTML)
      return elem.outerHTML; // has builtin implementation
    else {
      var attrs = elem.attributes;
      var str = "<" + tag;
      for (var i = 0; i < attrs.length; i++) {
        var val = attrs[i].value;
        var delim = val.indexOf('"') > -1 ? "'" : '"';
        str += " " + attrs[i].name + "=" + delim + val + delim;
      }
      return str + ">" + elem.innerHTML + "</" + tag + ">";
    }
  }

});

Class.checkOptions = function(defaultOptions, ctorOptions) {
  ctorOptions = ctorOptions || {}; // options passed to the class constructor
  for (var property in ctorOptions) {
    if (defaultOptions[property] === undefined)
      throw new Error("unexpected option: " + property);
  }
  return Object.extend(Object.clone(defaultOptions), ctorOptions);
};


Object.extend(Event, {

  detailedStop: function(event, toStop) {
    if (toStop.preventDefault) {
      if (event.preventDefault) event.preventDefault();
      else                      event.returnValue = false;
    }
    if (toStop.stopPropagation) {
      if (event.stopPropagation) event.stopPropagation();
      else                       event.cancelBubble = true;
    }
  },

  stopAll:  {stopPropagation: true, preventDefault: true},
  stopNone: {stopPropagation: false, preventDefault: false}

});

function ASSERT (cond, msg) {
  if (!cond)
    throw new Error("Violated assertion: " + msg);
}

// detects if a global CSS_PREFIX has been set
// if yes, use it to prefix the css classes
// default to gva
function CSSPREFIX () {
    if(typeof CSS_PREFIX != 'undefined') {
        return (CSS_PREFIX)? CSS_PREFIX : 'gva';
    }
    return 'gva';
}

/**
 *
 * Cross-Browser Split 1.0.1 
 * (c) Steven Levithan <stevenlevithan.com>; MIT License
 * in order to fix a bug with String.prototype.split(RegExp) and Internet Explorer
 * [http://blog.stevenlevithan.com/archives/cross-browser-split]
 * An ECMA-compliant, uniform cross-browser split method
 *
 * */

var cbSplit;

// avoid running twice, which would break `cbSplit._nativeSplit`'s reference to the native `split`
if (!cbSplit) {

cbSplit = function (str, separator, limit) {
    // if `separator` is not a regex, use the native `split`
    if (Object.prototype.toString.call(separator) !== "[object RegExp]") {
        return cbSplit._nativeSplit.call(str, separator, limit);
    }

    var output = [],
        lastLastIndex = 0,
        flags = (separator.ignoreCase ? "i" : "") +
                (separator.multiline  ? "m" : "") +
                (separator.sticky     ? "y" : ""),
        separator = RegExp(separator.source, flags + "g"), // make `global` and avoid `lastIndex` issues by working with a copy
        separator2, match, lastIndex, lastLength;

    str = str + ""; // type conversion
    if (!cbSplit._compliantExecNpcg) {
        separator2 = RegExp("^" + separator.source + "$(?!\\s)", flags); // doesn't need /g or /y, but they don't hurt
    }

    /* behavior for `limit`: if it's...
    - `undefined`: no limit.
    - `NaN` or zero: return an empty array.
    - a positive number: use `Math.floor(limit)`.
    - a negative number: no limit.
    - other: type-convert, then use the above rules. */
    if (limit === undefined || +limit < 0) {
        limit = Infinity;
    } else {
        limit = Math.floor(+limit);
        if (!limit) {
            return [];
        }
    }