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/*
 * The MIT License
 *
 * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

UTILITIES_VERSION = 0.1;

/**
 * I'm nothing more than a collection of static utility methods for
 * doing various things.
 */
function Utilities() {}

/**
 * I remove all the children of the specified parent node.
 *
 * @param parent The node whose children should be removed
 */
Utilities.removeChildren = function (parent) {
  for (var i = parent.childNodes.length - 1; i >= 0; i--) {
    parent.removeChild(parent.childNodes[i]);
  }
};

/**
 * I return an object with an x and y fields, indicating the object's
 * offset from the top left corner of the document.  The 'offsets'
 * argument is optional; if not provided, one will be initialized and
 * used.  It is exposed as a parameter because it can be useful for
 * computing deltas.  The 'object' parameter can be either an actual
 * document element, or the ID of one.
 *
 * @param object The object to compute the offset of.  May be an object
 *		or the ID of one.
 * @param offsets The starting offsets to calculate from.  In almost
 *		all cases, this should be omitted.
 * @return An offsets object with x and y fields, indicating the
 *		computed offsets for the object.  If an offsets object is
 *		passed, that will be the object returned, though the values
 *		will have been changed.
 */
Utilities.getOffsets = function (object, offsets) {
  if (!offsets) {
    offsets = new Object();
    offsets.x = offsets.y = 0;
  }
  if (typeof object == "string") {
    object = document.getElementById(object);
  }
  offsets.x += object.offsetLeft;
  offsets.y += object.offsetTop;
  do {
    object = object.offsetParent;
    if (!object) {
      break;
    }
    offsets.x += object.offsetLeft;
    offsets.y += object.offsetTop;
  } while (object.tagName.toUpperCase() != "BODY");
  return offsets;
};

/**
 *
 */
Utilities.listAppend = function (list, value, delimiter) {
  if (typeof delimiter == "undefined") {
    delimiter = ",";
  }
  if (list == "") {
    return value;
  } else {
    return list + delimiter + value;
  }
};