/******************************************************************************
* Copyright 2000 by Mike Hall                                                 *
* Please see http://www.brainjar.com for terms of use.                        *
*                                                                             *
* Code for the site menu.                                                     *
******************************************************************************/

// Determine browser type (Netscape 6 or IE 5.5/6.0).

var isIE5 = (navigator.userAgent.indexOf("MSIE 5.5") > 0  |
             navigator.userAgent.indexOf("MSIE 6.0") > 0) ? 1 : 0;
var isNS6 = (navigator.userAgent.indexOf("Gecko")    > 0) ? 1 : 0;

// Global variable for tracking the currently active button.

var activeButton = null;

// Depressed button style values.

var depressedBackgroundColor = "#333399";
var depressedColor           = "#ffffff";
var depressedNWBorderColor   = "#305070";
var depressedSEBorderColor   = "#b0d0f0";


// Capture mouse clicks on the page so any active button can be deactivated.

if (isIE5)
  document.onmousedown = pageMousedown;
if (isNS6)
  document.addEventListener("mousedown", pageMousedown, true);

function pageMousedown(event) {

  var className;

  // If the object clicked on was not a menu button or item, close any active
  // menu.

  if (isIE5)
    className = window.event.srcElement.className;
  if (isNS6)
    className = (event.target.className ?
      event.target.className : event.target.parentNode.className);

  if (className != "menuButton" && className != "menuItem" && activeButton)
    resetButton(activeButton);
}

function buttonClick(button, menuName) {

  // Blur focus from the link to remove that annoying outline.

  button.blur();

  // Associate the named menu to this button if not already done.

  if (!button.menu)
    button.menu = document.getElementById(menuName);

  // Reset the currently active button, if any.

  if (activeButton&& activeButton != button)
    resetButton(activeButton);

  // Toggle the button's state.

  if (button.isDepressed)
    resetButton(button);
  else
    depressButton(button);

  return false;
}

function buttonMouseover(button, menuName) {

  // If any other button menu is active, deactivate it and activate this one.

  if (activeButton && activeButton != button) {
    resetButton(activeButton);
    if (menuName)
      buttonClick(button, menuName);
  }
}

function depressButton(button) {

  // Save current style values so they can be restored later. Only needs to be
  // done once.

  if (!button.oldBackgroundColor) {
    button.oldBackgroundColor   = button.style.backgroundColor;
    button.oldColor             = button.style.color;
    button.oldBorderTopColor    = button.style.borderTopColor;
    button.oldBorderRightColor  = button.style.borderRightColor;
    button.oldBorderBottomColor = button.style.borderBottomColor;
    button.oldBorderLeftColor   = button.style.borderLeftColor;
    button.oldPosition = button.style.position;
    button.oldLeft     = button.style.left;
    button.oldTop      = button.style.top;
  }

  // Change style value to make the button looks like it's
  // depressed.

  button.style.backgroundColor   = depressedBackgroundColor;
  button.style.color             = depressedColor;
  button.style.borderTopColor    = depressedNWBorderColor;
  button.style.borderRightColor  = depressedSEBorderColor;
  button.style.borderBottomColor = depressedSEBorderColor;
  button.style.borderLeftColor   = depressedNWBorderColor;
  button.style.position = "relative";
  button.style.left     = "1px";
  button.style.top      = "1px";

  // For IE, force first menu item to the width of the parent menu, this
  // causes mouseovers work for all items even when cursor is not over the
  // link text.

  if (isIE5 && !button.menu.firstChild.style.width)
    button.menu.firstChild.style.width =
      button.menu.offsetWidth + "px";

  // Position the associated drop down menu under the button and show it. Note
  // that the position must be adjusted according to the brower type.

  x = getPageOffsetLeft(button);
  y = getPageOffsetTop(button) + button.offsetHeight;
  if (isNS6) {
    x--;
    y--;
  }
  button.menu.style.left = x + "px";
  button.menu.style.top  = y + "px";
  button.menu.style.visibility = "visible";

  // Set button state and let the world know which button is active.

  button.isDepressed = true;
  activeButton = button;
}

function resetButton(button) {

  // Restore the button's style settings.

  button.style.backgroundColor = button.oldBackgroundColor;
  button.style.borderBottomColor = button.oldBorderBottomColor;
  button.style.borderRightColor = button.oldBorderRightColor;
  button.style.borderTopColor = button.oldBorderTopColor;
  button.style.borderLeftColor = button.oldBorderLeftColor;
  button.style.color = button.oldColor;
  button.style.left = button.oldLeft
  button.style.position = button.oldPosition;
  button.style.top = button.oldTop;

  // Hide the button's menu.

  if (button.menu)
    button.menu.style.visibility = "hidden";

  // Set button state and clear active menu global.

  button.isDepressed = false;
  activeButton = null;
}

function getPageOffsetLeft(el) {

  // Return the true x coordinate of an element relative to the page.

  return el.offsetLeft +
    (el.offsetParent ? getPageOffsetLeft(el.offsetParent) : 0);
}

function getPageOffsetTop(el) {

  return el.offsetTop +
    (el.offsetParent ? getPageOffsetTop(el.offsetParent) : 0);
}