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<!-- Menu Bar Demo                                        -->
<!--                                                      -->
<!-- Copyright 2000 by Mike Hall                          -->
<!-- Please see http://www.brainjar.com for terms of use. -->
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// Determine browser and version.

function Browser() {

  var ua, s, i;

  this.isIE    = false;  // Internet Explorer
  this.isNS    = false;  // Netscape
  this.version = null;

  ua = navigator.userAgent;

  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  // Treat any other "Gecko" browser as NS 6.1.
  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = 6.1;
    return;
  }
}
var browser = new Browser();
// Global variable for tracking the currently active button.
var activeButton = null;
// Capture mouse clicks on the page so any active button can be
// deactivated.
if (browser.isIE)
  document.onmousedown = pageMousedown;
if (browser.isNS)
  document.addEventListener("mousedown", pageMousedown, true);

function pageMousedown(event) {
  var el;
  // If there is no active menu, exit.
  if (!activeButton)
  return;
  // Find the element that was clicked on.
  if (browser.isIE)
    el = window.event.srcElement;
  if (browser.isNS)
    el = (event.target.className ? event.target : event.target.parentNode);
  // If the active button was clicked on, exit.
  if (el == activeButton)
    return;
  // If the element clicked on was not a menu button or item, close the
  // active menu.
  //if (el.className != "menuButton"  && el.className != "menuItem" &&
  //    el.className != "menuItemSep" && el.className != "menu" && el.className != "menuPicShop")
  //  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.
  // Note: if this button has no menu, leave the active menu alone.
  if (activeButton && activeButton != button) {
    resetButton(activeButton);
    if (menuName)
      buttonClick(button, menuName);
  }
}

function depressButton(button) {
  var w, dw, x, y;
  // Change the button's style class to make it look like it's depressed.
  button.className = "menuButtonActive";

  // For IE, set an explicit width on the first menu item. This will
  // cause link hovers to work on all the menu's items even when the
  // cursor is not over the link's text.

  if (browser.isIE && !button.menu.firstChild.style.width) {
    w = button.menu.firstChild.offsetWidth;
    button.menu.firstChild.style.width = w + "px";
    dw = button.menu.firstChild.offsetWidth - w;
    w -= dw;
    button.menu.firstChild.style.width = w + "px";
  }

  // Position the associated drop down menu under the button and
  // show it. Note that the position must be adjusted according to
  // browser, styling and positioning.

  x = getPageOffsetLeft(button);
  y = getPageOffsetTop(button) + button.offsetHeight;
  if (browser.isIE) {
    x += 2;
    y += 2;
  }
  if (browser.isNS && browser.version < 6.1)
    y--;
  // Position and show the menu.
  button.menu.style.left = x - "10";
  button.menu.style.top  = y - "0";
  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 class.
  button.className = "menuButton";
  // 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 the true y coordinate of an element relative to the page.
  return el.offsetTop + (el.offsetParent ? getPageOffsetTop(el.offsetParent) : 0);
}