var isDOM = (document.getElementById ? true : false);
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);
var isOpera = (navigator.userAgent.indexOf("Opera")!=-1 ? true : false);

function getRef(id) {
  if (isDOM) return document.getElementById(id);
  if (isIE4) return document.all[id];
  if (isNS4) return document.layers[id];
}

function getSty(id) {
  return (isNS4 ? getRef(id) : getRef(id).style);
}

// Hide timeout.
var popTimer = 0;
// Array showing highlighted menu items.
var litNow = new Array();

function popOver(menuNum, itemNum) {
  clearTimeout(popTimer);
  hideAllBut(menuNum);
  litNow = getTree(menuNum, itemNum);
  changeCol(litNow, true);
  targetNum = menu[menuNum][itemNum].target;
  if (targetNum > 0) {
    thisX = parseInt(menu[menuNum][0].ref.left) + parseInt(menu[menuNum][itemNum].ref.left);
    thisY = parseInt(menu[menuNum][0].ref.top) + parseInt(menu[menuNum][itemNum].ref.top);
    with (menu[targetNum][0].ref) {
      left = parseInt(thisX + menu[targetNum][0].x);
      top = parseInt(thisY + menu[targetNum][0].y);
      visibility = 'visible';
    }
  }
}

function popOut(menuNum, itemNum) {
  if ((menuNum == 0) && !menu[menuNum][itemNum].target) hideAllBut(0)
  else popTimer = setTimeout('hideAllBut(0)', 500);
}

function getTree(menuNum, itemNum) {
// Array index is the menu number. The contents are null (if that menu is not a parent)
// or the item number in that menu that is an ancestor (to light it up).
  itemArray = new Array(menu.length);

  while(1) {
    itemArray[menuNum] = itemNum;
    // If we've reached the top of the hierarchy, return.
    if (menuNum == 0) return itemArray;
    itemNum = menu[menuNum][0].parentItem;
    menuNum = menu[menuNum][0].parentMenu;
  }
}

// Pass an array and a boolean to specify colour change, true = over colour.
function changeCol(changeArray, isOver) {
  for (menuCount = 0; menuCount < changeArray.length; menuCount++) {
    if (changeArray[menuCount]) {
      newCol = isOver ? menu[menuCount][0].overCol : menu[menuCount][0].backCol;
      // Change the colours of the div/layer background.
      with (menu[menuCount][changeArray[menuCount]].ref) {
        if (isNS4) bgColor = newCol;
        else backgroundColor = newCol;
      }
    }
  }
}

function hideAllBut(menuNum) {
  var keepMenus = getTree(menuNum, 1);
  for (count = 0; count < menu.length; count++)
    if (!keepMenus[count]) menu[count][0].ref.visibility = 'hidden';
  changeCol(litNow, false);
}

function Menu(isVert, popInd, x, y, width, overCol, backCol, borderClass, textClass) {
  this.isVert = isVert; // True or false - a vertical menu?
  this.popInd = popInd; // The popout indicator used (if any) for this menu.

  this.x = x; // Position and size settings.
  this.y = y;
  this.width = width;

  this.overCol = overCol; // Colours of menu and items.
  this.backCol = backCol;

  this.borderClass = borderClass; // The stylesheet class used for item borders and the text within items.
  this.textClass = textClass;

  this.parentMenu = null; // Parent menu and item numbers, indexed later.
  this.parentItem = null;

  this.ref = null; // Reference to the object's style properties (set later).
}

function Item(text, href, frame, length, spacing, target) {
  this.text = text;
  this.href = href;
  this.frame = frame;
  this.length = length;
  this.spacing = spacing;
  this.target = target;
  // Reference to the object's style properties (set later).
  this.ref = null;
}

function writeMenus() {
  if (isOpera) return;
  if (!isDOM && !isIE4 && !isNS4) return;

  for (currMenu = 0; currMenu < menu.length; currMenu++) with (menu[currMenu][0]) {
    var str = '', itemX = 0, itemY = 0;   // Variable for holding HTML for items and positions of next item.

    // Remember, items start from 1 in the array (0 is menu object itself, above).
    // Also use properties of each item nested in the other with() for construction.
    for (currItem = 1; currItem < menu[currMenu].length; currItem++) with (menu[currMenu][currItem]) {
      var itemID = 'menu' + currMenu + 'item' + currItem;
      var w = (isVert ? width : length); // The width and height of the menu item - dependent on orientation!
      var h = (isVert ? length : width);

      // Create a div or layer text string with appropriate styles/properties.
      if (isDOM || isIE4) {
        str += '<div id="' + itemID + '" style="position: absolute; left: ' + itemX + '; top: ' + itemY + '; width: ' + w + '; height: ' + h + '; visibility: inherit; ';
        if (backCol) str += 'background: ' + backCol + '; ';
        str += '" ';
      }
      if (isNS4 && currMenu==0 ) { itemX=itemX+8; itemY=itemY+8; }
      if (isNS4) {
        str += '<layer id="' + itemID + '" left="' + itemX + '" top="' + itemY + '" width="' +  w + '" height="' + h + '" visibility="inherit" ';
        if (backCol) str += 'bgcolor="' + backCol + '" ';
      }
      if (borderClass) str += 'class="' + borderClass + '" ';

      // Add mouseover handlers and finish div/layer.
      str += 'onMouseOver="popOver(' + currMenu + ',' + currItem + ')" onMouseOut="popOut(' + currMenu + ',' + currItem + ')">';

      // Add contents of item (default: table with link inside).
      str += '<table width="' + (w - 8) + '" border="0" cellspacing="0" cellpadding="' + (!isNS4 && borderClass ? 3 : 0) + '"><tr><td align="left" height="' + (h - 7) + '"  onClick="location.href=&quot;'+href+'&quot;;" style=cursor:hand;>' + '&nbsp;<a class="' + textClass + '" href="' + href + '"' + (frame ? ' target="' + frame + '">' : '>') + text + '</a></td>';
      if (target > 0) {
        menu[target][0].parentMenu = currMenu; // Set target's parents to this menu item.
        menu[target][0].parentItem = currItem;
        // Add a popout indicator.
        if (popInd) str += '<td class="' + textClass + '" align="right">' + popInd + '</td>';
      }
      str += '</tr></table>' + (isNS4 ? '</layer>' : '</div>');
      if (isVert) itemY += length + spacing;
      else itemX += length + spacing;
    }
    if (isDOM) {
      var newDiv = document.createElement('div');
      document.getElementsByTagName('body').item(0).appendChild(newDiv);
      newDiv.innerHTML = str;
      ref = newDiv.style;
      ref.position = 'absolute';
      ref.visibility = 'hidden';
    }

    if (isIE4) {
      document.body.insertAdjacentHTML('beforeEnd', '<div id="menu' + currMenu + 'div" ' + 'style="position: absolute; visibility: hidden">' + str + '</div>');
      ref = getSty('menu' + currMenu + 'div');
    }

    if (isNS4) {
      ref = new Layer(0);
      ref.document.write(str);
      ref.document.close();
    }

    for (currItem = 1; currItem < menu[currMenu].length; currItem++) {
      itemName = 'menu' + currMenu + 'item' + currItem;
      if (isDOM || isIE4) menu[currMenu][currItem].ref = getSty(itemName);
      if (isNS4) menu[currMenu][currItem].ref = ref.document[itemName];
    }
  }
  with(menu[0][0]) {
    ref.left = x;
    ref.top = y;
    ref.visibility = 'visible';
  }
}

// menu[menuNumber][0] = new Menu(Vertical menu? (true/false), 'popout indicator', left, top,
// width, 'mouseover colour', 'background colour', 'border stylesheet', 'text stylesheet');
//
// Left and Top are measured on-the-fly relative to the top-left corner of its trigger, or
// for the root menu, the top-left corner of the page.
//
// menu[menuNumber][itemNumber] = new Item('Text', 'URL', 'target frame', length of menu item,
//  additional spacing to next menu item, number of target menu to popout);
//
// Something that needs explaining - the Vertical Menu setup. You can see most menus below
// are 'true', that is they are vertical, except for the first root menu. The 'length' and
// 'width' of an item depends on its orientation -- length is how long the item runs for in
// the direction of the menu, and width is the lateral dimension of the menu.

var menu = new Array();

var defOver = '#A0F4A0', defBack = '#cccccc';
var defHeight = 17;
var doubleHeight = 34;
var tripleHeight = 48;
var quadHeight = 60;
var defWidth = 80;

//
// These two lines handle the window resize bug in NS4. See <body onResize="...">.
var popOldWidth = window.innerWidth;
nsResizeHandler = new Function('if (popOldWidth != window.innerWidth) location.reload()');

if (isNS4) document.captureEvents(Event.CLICK);
document.onclick = clickHandle;

function clickHandle(evt) {
  if (isOpera) return;
  if (isNS4) document.routeEvent(evt);
  hideAllBut(0);
}

menu[0] = new Array();
menu[0][0] = new Menu(false, '', 30, 77, 15, '#A0F4A0', '#A0F4A0', '', '');
menu[0][1] = new Item('Menu', 'index.php', '', 40, 0, 1);


menu[1] = new Array();
menu[1][0] = new Menu(true, '»', 0, 16, 120, '#A0F4A0', defBack, '', '');
menu[1][1] = new Item('About the SUC','search.php?topic=36','', defHeight, 0, 2);
menu[1][2] = new Item('News and Events','search.php?topic=30','', defHeight, 0, 3);
menu[1][3] = new Item('System Index','search.php?topic=40','', defHeight, 0, 4);
menu[1][4] = new Item('General Information','search.php?topic=93','', defHeight, 0, 0);
menu[1][5] = new Item('Business Index','search.php?topic=39','', defHeight, 0, 0);
menu[1][6] = new Item('The Gallery','modules.php?op=modload&name=My_eGallery&file=index','', defHeight, 0, 5);
menu[1][7] = new Item('Special Sections','modules.php?op=modload&name=Sections&file=index','', defHeight, 0, 6);
menu[1][8] = new Item('Discussion Forum','modules.php?op=modload&name=XForum&file=index','', defHeight, 0, 7);

menu[6] = new Array();
menu[6][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[6][1] = new Item('SUC Shop','modules.php?op=modload&name=Sections&file=index&req=listarticles&secid=2','', defHeight, 0, 0);

menu[7] = new Array();
menu[7][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[7][1] = new Item('Sharp Users Club','modules.php?op=modload&name=XForum&file=indexnav&gid=39','', defHeight, 0, 8);
menu[7][2] = new Item('Website','modules.php?op=modload&name=XForum&file=indexnav&gid=22','', defHeight, 0, 9);

menu[8] = new Array();
menu[8][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[8][1] = new Item('Club Announcements','modules.php?op=modload&name=XForum&file=forumdisplay&fid=3','', defHeight, 0, 0);
menu[8][2] = new Item('Computer advice','modules.php?op=modload&name=XForum&file=forumdisplay&fid=23','', defHeight, 0, 0);
menu[8][3] = new Item('mzBay - Sharp Sal...','modules.php?op=modload&name=XForum&file=forumdisplay&fid=4','', defHeight, 0, 10);
menu[8][4] = new Item('General Chat','modules.php?op=modload&name=XForum&file=forumdisplay&fid=41','', defHeight, 0, 0);

menu[10] = new Array();
menu[10][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[10][1] = new Item('For Sale','modules.php?op=modload&name=XForum&file=forumdisplay&fid=14','', defHeight, 0, 0);
menu[10][2] = new Item('Wanted','modules.php?op=modload&name=XForum&file=forumdisplay&fid=15','', defHeight, 0, 0);
menu[10][3] = new Item('Loan Requests','modules.php?op=modload&name=XForum&file=forumdisplay&fid=42','', defHeight, 0, 0);

menu[9] = new Array();
menu[9][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[9][1] = new Item('Website Feedback','modules.php?op=modload&name=XForum&file=forumdisplay&fid=13','', defHeight, 0, 0);

menu[2] = new Array();
menu[2][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[2][1] = new Item('Magazine Archive','modules.php?op=modload&name=sucmag&file=index','', defHeight, 0, 0);
menu[2][2] = new Item('Website Information','search.php?topic=31','', defHeight, 0, 0);

menu[3] = new Array();
menu[3][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[3][1] = new Item('Recent News','search.php?topic=55','', defHeight, 0, 0);
menu[3][2] = new Item('What\'s On','search.php?topic=35','', defHeight, 0, 0);
menu[3][3] = new Item('Related Events','search.php?topic=45','', defHeight, 0, 0);
menu[3][4] = new Item('This Month','modules.php?op=modload&name=calendar&file=index','', defHeight, 0, 0);
menu[3][5] = new Item('The SUC Year','modules.php?op=modload&name=tcy&file=index','', defHeight, 0, 0);

menu[4] = new Array();
menu[4][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[4][1] = new Item('MZ-80K Section','search.php?topic=87','', defHeight, 0, 0);
menu[4][2] = new Item('MZ-80A Section','search.php?topic=86','', defHeight, 0, 0);
menu[4][3] = new Item('MZ-80B Section','search.php?topic=88','', defHeight, 0, 0);
menu[4][4] = new Item('MZ-700 Section','search.php?topic=89','', defHeight, 0, 0);
menu[4][5] = new Item('MZ-800 Section','search.php?topic=90','', defHeight, 0, 0);
menu[4][6] = new Item('PC Section','search.php?topic=91','', defHeight, 0, 0);

menu[5] = new Array();
menu[5][0] = new Menu(true, '»', 120, 0, 120, defOver, defBack, '', '');
menu[5][1] = new Item('Club Events','modules.php?op=modload&name=My_eGallery&file=index&do=showgall&gid=37','', defHeight, 0, 0);
menu[5][2] = new Item('Sharp Machines','modules.php?op=modload&name=My_eGallery&file=index&do=showgall&gid=36','', defHeight, 0, 0);