Menu waiting to hide himself

    <div id="menuButton"></div>
    <div id="entete">
        <ul>
            <li> menu item 1 </li>
            ...
            <li> menu item n </li>
        </ul>
    </div>

    #entete {
      top: 1em;
      left: 0;
      position: fixed;
      width: 10em;
      z-index: 2000; }
    
    #entete {
      top: 1em;
      height: 22em;
      left: 0;
      position: fixed;
      width: 10em; }

var last=0;

// will hide the menu in 5 seconds
// if the variable 'last' has not changed its value
function autoHideMenu(value) {
    setTimeout(function(){
        if ( last == value ) { hideMenu(); }
    },5000);
}

$(document).ready( function() {
    // show the menu when the mouse is on
    // the good area
    $('#menuButton').hover(showMenu);

    // If the mouse is on the menu change the
    // value of 'last'
    // try to hide the menu when the mouse 
    // go out off the menu.
    $('#entete').hover(
        function(){last+=1;}, 
        function(){autoHideMenu(last);} );
    autoHideMenu(0);
});

// show / hide menu functions details

// move to the left
function hideMenu() { 
    $('#entete').animate({left:"-10em"}, 500 ); 
}

// move to right and will try to hide in 5 sec.
function showMenu() { 
    $('#entete').animate({left:"0em"}, 500 );
    last+=1;
    autoHideMenu(last);
}