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Echo2 bundled with Echo2_Extras, Echo2_FileTransfer and echopointing and various improvements/bugfixes
There is a newer version: 2.0.4
/* 
 * This file is part of the Echo2 Extras Project.
 * Copyright (C) 2002-2009 NextApp, Inc.
 *
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 */

ExtrasUtil = { };

ExtrasUtil.Arrays = {

    indexOf: function(array, element) {
        for (var i = 0; i < array.length; ++i) {
            if (array[i] == element) {
                return i;
            }
        }
        return -1;
    },
    
    insertElement: function(array, element, index) {
        if (index === 0) {
            array.unshift(element);
        } else if (index == -1 || index == array.length) {
            array.push(element);
        } else if (index > array.length) {
            throw "Array index of bounds: " + index + " (size=" + array.length + ")";
        } else {
            for (var i = array.length - 1; i >= index; --i) {
                array[i + 1] = array[i];
            }
            array[index] = element;
        }
    },
    
    removeElement: function(array, element) {
        var index = ExtrasUtil.Arrays.indexOf(array, element);
        if (index == -1) {
            return;
        }
        ExtrasUtil.Arrays.removeIndex(array, index);
    },
    
    removeIndex: function(array, index) {
        for (var i = index; i < array.length - 1; ++i) {
            array[i] = array[i + 1];
        }
        array.length = array.length - 1;
    }
};

ExtrasUtil.Color = {
 
    adjustIntensity: function(colorString, factor) {
        if (colorString.length != 7 || colorString.charAt(0) != "#") {
            throw "Invalid color: " + colorString;
        }
        var red = parseInt(colorString.substring(1, 3), 16);
        var green = parseInt(colorString.substring(3, 5), 16);
        var blue = parseInt(colorString.substring(5, 7), 16);
        red = parseInt(red * factor, 10);
        green = parseInt(green * factor, 10);
        blue = parseInt(blue * factor, 10);
        red = red < 0x100 ? red : 0xff;
        green = green < 0x100 ? green : 0xff;
        blue = blue < 0x100 ? blue : 0xff;
        var out = "#";
        if (red < 0x10) {
            out += "0";
        }
        out += red.toString(16);
        if (green < 0x10) {
            out += "0";
        }
        out += green.toString(16);
        if (blue < 0x10) {
            out += "0";
        }
        out += blue.toString(16);
        return out;
    }
};