// the timeout for the menu
var timeout = 1000;

// not very clean but simple
// the function can be run in the HTML for faster display
// window.onload=initMenu;

// creat timeout variables for list item
// it's for avoid some warning with IE
for( var i = 0; i < 100; i++ ) {
  eval("var timeoutli" + i + " = false;");
}

// this fonction apply the CSS style and the event
function initMenu() {
  // a test to avoid some browser like IE4, Opera 6, and IE Mac
  if ( browser.isDOM1 && !( browser.isMac && browser.isIE ) && !( browser.isOpera && browser.versionMajor < 7 ) && !( browser.isIE && browser.versionMajor < 5 )) {
    // get some element
    var menu = document.getElementById('menu'); // the root element
    var lis = menu.getElementsByTagName('li'); // all the li

    // change the class name of the menu,
    // it's usefull for compatibility with old browser
    menu.className='menu';

    // i am searching for ul element in li element
    for ( var i=0; i<lis.length; i++ ) {
      // is there a ul element ?
      if ( lis.item(i).getElementsByTagName('ul').length > 0 ) {
        // improve IE key navigation
        if ( browser.isIE ) {
          addAnEvent(lis.item(i),'keyup',show);
        }
        // link events to list item
        addAnEvent(lis.item(i),'mouseover',show);
        addAnEvent(lis.item(i),'mouseout',timeoutHide);
        addAnEvent(lis.item(i),'blur',timeoutHide);
        addAnEvent(lis.item(i),'focus',show);

        // add an id to list item
        lis.item(i).setAttribute( 'id', "li"+i );
      }
    }
  }
}

function addAnEvent( target, eventName, functionName ) {
  // apply the method to IE
  if ( browser.isIE ) {
    //attachEvent dont work properly with this
    eval('target.on'+eventName+'=functionName');
  }
  // apply the method to DOM compliant browsers
  else {
    target.addEventListener( eventName , functionName , true ); // true is important for Opera7
  }
}

// hide the first ul element of the current element
function timeoutHide() {
  // start the timeout
  eval( "timeout" + this.id + " = window.setTimeout('hideUlUnder( \"" + this.id + "\" )', " + timeout + " );");
}

// hide the ul elements under the element identified by id
function hideUlUnder( id ) {
  document.getElementById(id).getElementsByTagName('ul')[0].style['visibility'] = 'hidden';
}

// show the first ul element found under this element
function show() {
  // show the sub menu
  this.getElementsByTagName('ul')[0].style['visibility'] = 'visible';
  var currentNode=this;
  while(currentNode) {
    if (currentNode.nodeName=='LI') {
      currentNode.getElementsByTagName('a')[0].className = 'linkOver';
    }
    currentNode=currentNode.parentNode;
  }
  // clear the timeout
  eval ( "clearTimeout( timeout"+ this.id +");" );
  hideAllOthersUls( this );
}

// hide all ul on the same level of  this list item
function hideAllOthersUls( currentLi ) {
  var lis = currentLi.parentNode;
  for ( var i=0; i<lis.childNodes.length; i++ ) {
    if ( lis.childNodes[i].nodeName=='LI' && lis.childNodes[i].id != currentLi.id ) {
      hideUlUnderLi( lis.childNodes[i] );
    }
  }
}

// hide all the ul wich are in the li element
function hideUlUnderLi( li ) {
  var as = li.getElementsByTagName('a');
  for ( var i=0; i<as.length; i++ ) {
    as.item(i).className="";
  }
  var uls = li.getElementsByTagName('ul');
  for ( var i=0; i<uls.length; i++ ) {
    uls.item(i).style['visibility'] = 'hidden';
  }
}