//*****************************************************************************
// Do not remove this notice.
//
// Copyright 2000 by Mike Hall.
// See http://www.brainjar.com for terms of use.
//*****************************************************************************

// Code adapted for Systematic Business Solutions Ltd by Richard James, 2003

// Utility functions

// Detect browser
function detectBrowser () {
 var ua, i;
 this.isIE = false;
 this.isNS = false;
 this.version = null;
 ua = navigator.userAgent;

 if ((i = ua.indexOf ("MSIE")) >= 0) {
  this.isIE = true;
  this.version = parseFloat(ua.substr(i + 4));
  return;
 }

 if ((i = ua.indexOf ("Netscape6/")) >= 0) {
  this.isNS = true;
  this.version = parseFloat(ua.substr(i + 10));
  return;
 }

 // Treat any other "Gecko" browser as NS 6.1
 if ((i = ua.indexOf ("Gecko")) >= 0) {
  this.isNS = true;
  this.version = 6.1;
  return;
 }
}

// Global variables
var browser = new detectBrowser ();

// Launch a new window
function launch (url, width, height, text) {
 height += 16;
 width += 16;
 params = 'left=50, top=50, height=' + height + ', width=' + width;
 jswindow = window.open ('', 'jswindow', params);
 jswindow.document.writeln ('<html><head><title>' + text + '</title></head><body background=\"white\" style=\"margin: 8px;\"><img src=\"' + url + '\" /></body></html>');
}

// Starting with the given node, find the nearest containing element with the specified tag name and style class
function getContainerWith (node, tagName, className) {
 while (node != null) {
  if (node.tagName != null && node.tagName == tagName && hasClassName (node, className))
   return node;
  node = node.parentNode;
 }
 return node;
}


// Returns true if the given element currently has the given class name
function hasClassName (el, name) {
 var i, list;
 list = el.className.split (" ");
 for (i = 0; i < list.length; i++)
  if (list[i] == name)
   return true;
 return false;
}


// Removes the given class name from the element's className property
function removeClassName (el, name) {
 var i, curList, newList;
 if (el.className == null)
  return;

 newList = new Array ();
 curList = el.className.split (" ");
 for (i = 0; i < curList.length; i++)
  if (curList[i] != name)
   newList.push (curList[i]);
 el.className = newList.join (" ");
}


// Returns the x coordinate of an element relative to the page
function getPageOffsetLeft (el) {
 var x;
 x = el.offsetLeft;
 if (el.offsetParent != null)
  x += getPageOffsetLeft (el.offsetParent);
 return x;
}


// Returns the y coordinate of an element relative to the page
function getPageOffsetTop (el) {
 var y;
 y = el.offsetTop;
 if (el.offsetParent != null)
  y += getPageOffsetTop (el.offsetParent);
 return y;
}


 // Menu-specific functions

// Stop IE5 from loading menu and causing errors
if (!browser.isIE || browser.version >= 5.5) {

 // Global variables
 var activeButton = null;

 // Detects mouse over menu button
 function buttonActivate (event, menuId) {
  var button;

  // Get the target button element
  if (browser.isIE)
   button = window.event.srcElement;
  else
   button = event.currentTarget;

  // Initialise and associate the named menu to this button if not already done
  if (button.menu == null) {
   button.menu = document.getElementById (menuId);
   if (button.menu.isInitialized == null)
    menuInit (button.menu);
  }

  // Set mouseout event handler for the button, if not already done
  if (button.onmouseout == null)
   button.onmouseout = buttonOrMenuMouseout;

  // Exit if this button is the currently active one
  if (button == activeButton)
   return false;

  // Reset the currently active button, if any
  if (activeButton != null)
   resetButton (activeButton);

  // Activate this button, unless it was the currently active one
  if (button != activeButton) {
   highlightButton (button);
   activeButton = button;
  }
  else
   activeButton = null;

  return false;
 }


 // Activates this button's menu if no other is currently active
 function buttonMouseover (event, menuId) {
  var button;
  if (activeButton == null) {
   buttonActivate (event, menuId);
   return;
  }

  // Find the target button element
  if (browser.isIE)
   button = window.event.srcElement;
  else
   button = event.currentTarget;

  // If any other button menu is active, make this one active instead
  if (activeButton != null && activeButton != button)
   buttonActivate (event, menuId);
 }


 // Updates the button's style class
 function highlightButton (button) {
  var x, y;
  button.className += " active";

  // Set mouseout event handler for the button, if not already done
  if (button.onmouseout == null)
   button.onmouseout = buttonOrMenuMouseout;
  if (button.menu.onmouseout == null)
   button.menu.onmouseout = buttonOrMenuMouseout;

  // Position the associated drop down menu under the button and show it
  x = getPageOffsetLeft (button);
  y = getPageOffsetTop (button) + button.offsetHeight;

  // For IE, adjust position
  if (browser.isIE) {
   x += button.offsetParent.clientLeft;
   y += button.offsetParent.clientTop;
  }

  y--;

  button.menu.style.left = x + "px";
  button.menu.style.top = y + "px";
  button.menu.style.visibility = "visible";
 }


 // Restores the button's style class
 function resetButton (button) {
  removeClassName (button, "active");

  // Hide the button's menu, first closing any sub menus
  if (button.menu != null) {
   closeSubMenu (button.menu);
   button.menu.style.visibility = "hidden";
  }
 }


 // Get activated menu
 function menuMouseover (event) {
  var menu;

  // Find the target menu element
  if (browser.isIE)
   menu = getContainerWith (window.event.srcElement, "DIV", "menu");
  else
   menu = event.currentTarget;

  // Close any active sub menu
  if (menu.activeItem != null)
   closeSubMenu (menu);
 }


 // Show menu
 function menuItemMouseover (event, menuId) {

  var item, menu, x, y;

  // Find the target item element and its parent menu element
  if (browser.isIE)
   item = getContainerWith (window.event.srcElement, "A", "");
  else
   item = event.currentTarget;
  menu = getContainerWith (item, "DIV", "menu");

  // Close any active sub menu and mark this one as active
  if (menu.activeItem != null)
   closeSubMenu (menu);
  menu.activeItem = item;

  // Highlight the item element
  item.className += " active";

  // Initialize the sub menu, if not already done
  if (item.subMenu == null) {
   item.subMenu = document.getElementById (menuId);
   if (item.subMenu.isInitialized == null)
    menuInit (item.subMenu);
  }

  // Set mouseout event handler for the sub menu, if not already done
  if (item.subMenu.onmouseout == null)
   item.subMenu.onmouseout = buttonOrMenuMouseout;

  // Get position for submenu based on the menu item
  x = getPageOffsetLeft (item) + item.offsetWidth;
  y = getPageOffsetTop (item);

  // Adjust position to fit in view
  var maxX, maxY;
  if (browser.isNS) {
   maxX = window.scrollX + window.innerWidth;
   maxY = window.scrollY + window.innerHeight;
  }

  if (browser.isIE) {
   maxX = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft) + (document.documentElement.clientWidth != 0 ? document.documentElement.clientWidth : document.body.clientWidth);
   maxY = Math.max(document.documentElement.scrollTop, document.body.scrollTop) + (document.documentElement.clientHeight != 0 ? document.documentElement.clientHeight : document.body.clientHeight);
  }
  maxX -= item.subMenu.offsetWidth;
  maxY -= item.subMenu.offsetHeight;

  if (x > maxX)
   x = Math.max (0, x - item.offsetWidth - item.subMenu.offsetWidth + (menu.offsetWidth - item.offsetWidth));
  y = Math.max (0, Math.min (y, maxY));

  x++;

  // Position and show the sub menu
  item.subMenu.style.left = x + "px";
  item.subMenu.style.top = y + "px";
  item.subMenu.style.visibility = "visible";

  // Stop the event from bubbling
  if (browser.isIE)
   window.event.cancelBubble = true;
  else
   event.stopPropagation ();
 }


 // Closes unneeded sub-menus
 function closeSubMenu (menu) {
  if (menu == null || menu.activeItem == null)
   return;

  // Recursively close any sub menus
  if (menu.activeItem.subMenu != null) {
   closeSubMenu (menu.activeItem.subMenu);
   menu.activeItem.subMenu.style.visibility = "hidden";
   menu.activeItem.subMenu = null;
  }
  removeClassName (menu.activeItem, "active");
  menu.activeItem = null;
 }


 // Detect mouseout events over menus
 function buttonOrMenuMouseout (event) {
  var el;

  // If there is no active button, exit
  if (activeButton == null)
   return;

  // Find the element the mouse is moving to
  if (browser.isIE)
   el = window.event.toElement;
  else if (event.relatedTarget != null)
    el = (event.relatedTarget.tagName ? event.relatedTarget : event.relatedTarget.parentNode);

  // If the element is not part of a menu, reset the active button
  if (getContainerWith (el, "DIV", "menu") == null) {
   resetButton (activeButton);
   activeButton = null;
  }
 }


 // Initialise menus to avoid display problems
 function menuInit (menu) {

  var itemList, spanList;
  var textEl, arrowEl;
  var itemWidth;
  var w, dw;
  var i, j;

  // For IE, replace arrow characters
  if (browser.isIE) {
   menu.style.lineHeight = "2.5ex";
   spanList = menu.getElementsByTagName ("SPAN");
   for (i = 0; i < spanList.length; i++)
    if (hasClassName (spanList[i], "arrow")) {
     spanList[i].style.fontFamily = "Webdings";
     spanList[i].firstChild.nodeValue = "4";
    }
  }

  // Find the width of a menu item
  itemList = menu.getElementsByTagName ("A");
  if (itemList.length > 0)
   itemWidth = itemList[0].offsetWidth;
  else
   return;

  // For items with arrows, add padding to item text to make the arrows flush right
  for (i = 0; i < itemList.length; i++) {
   spanList = itemList[i].getElementsByTagName ("SPAN");
   textEl = null;
   arrowEl = null;
   for (j = 0; j < spanList.length; j++) {
    if (hasClassName(spanList[j], "text"))
     textEl = spanList[j];
    if (hasClassName(spanList[j], "arrow"))
     arrowEl = spanList[j];
   }
   if (textEl != null && arrowEl != null)
    textEl.style.paddingRight = (itemWidth - (textEl.offsetWidth + arrowEl.offsetWidth)) + "px";
  }

  // Fix IE hover problem by setting an explicit width on first item of the menu
  if (browser.isIE) {
   w = itemList[0].offsetWidth;
   itemList[0].style.width = w + "px";
   dw = itemList[0].offsetWidth - w;
   w -= dw;
   itemList[0].style.width = w + "px";
  }

  // Mark menu as initialized
  menu.isInitialized = true;
 }
}
