var timer = new Array();
var visiblemenu = new Array();

function PositionMenu(tab, menu, alignment) {
  if(alignment == 0) {
    left = GetLeft(tab);
    menu.style.top = GetTop(tab) + GetHeight(tab);
  } else {
    left = GetLeft(tab) + GetWidth(tab);
    menu.style.top = GetTop(tab);
  }
  if(left + GetWidth(menu) > document.body.clientWidth) {
    left -= GetWidth(tab) + GetWidth(menu) + 1;
  }
  if(tab.className == "afterselectedtab") {
    menu.style.left = left - 1;
  } else {
    menu.style.left = left;
  }
}

//  return obj.offsetWidth;
function GetWidth(obj) {
  return obj.offsetWidth-4;
}

function GetLeft(obj) {
  var curleft = 0;
  if (obj.offsetParent) {
    while (obj.offsetParent) {
      curleft += obj.offsetLeft;
      obj = obj.offsetParent;
    }
  }
  else if(obj.x) {
    curleft += obj.x;
  }
  return curleft;
}

function GetTop(obj) {
  var curtop = 0;
  if (obj.offsetParent) {
    while (obj.offsetParent) {
      curtop += obj.offsetTop;
      obj = obj.offsetParent;
    }
  }
  else if(obj.y) {
    curtop += obj.y;
  }
  curtop -= 1;
  return curtop;
}

function GetHeight(obj) {
  return obj.offsetHeight;
}

function Show(num, alignment, level) {
  var tab = document.getElementById('TAB_' + num);
  var menu = document.getElementById('MENU_' + num);
  if(!menu) {
    return;
  }
  var i = level;
  do {
    clearTimeout(timer[i]);
    i--;
  } while(i >= 0);
  if(visiblemenu[level] != menu && visiblemenu[level] != null) {
    visiblemenu[level].style.visibility = "hidden";
  }
  PositionMenu(tab, menu, alignment);
  menu.style.visibility = "visible";
  menu.style.zIndex = level;
  visiblemenu[level] = menu;
}

function SetLink(linkname) {
  var link = document.getElementById('LINK_' + linkname);
  link.style.color = 'BLACK';
  <!-- link.offsetParent.offsetParent.style.backgroundColor = 'GRAY'; -->
}

function ReSetLink(linkname) {
  var link = document.getElementById('LINK_' + linkname);
  link.style.color = 'BLACK';
}

function CloseMenu(num, level) {
  var menu = document.getElementById('MENU_' + num);
  if(visiblemenu[level] != null && (visiblemenu[level] == menu || num == null)) {
    visiblemenu[level].style.visibility = "hidden";
    i = (level-1);
    if(level > 0) {
      menuid = visiblemenu[i].id;
      menuid = menuid.substr(5, menuid.length - 5);
      clearTimeout(timer[i]);
      Hide(menuid, i);
    }
  }
}

function Hide(num, level) {
  var i = (level - 1);
  timer[level] = setTimeout("CloseMenu('" + num + "', '" + level + "')", 250);
}