Entire drop-down menu quickly flashes upon page load

Question

I have a standard drop-down menu that uses jQuery to hide the children li elements. However, upon loading the site, the child elements quickly appear and subsequently disappear (sort of like a quick flash). I don't think this is at all related to the flash-of-unstyled-content known issue.

The site is in Hebrew, but that shouldn't affect anything. The site is located here

If you'd like a sample HTML + CSS and the Javascript code, I would gladly post it here.

I was just wondering if anyone has encountered this issue before. I'm seeing it in Chrome, and I haven't really checked if it also happens in IE and Firefox.

Thanks!

EDIT: HTML/CSS/JS shown below:

HTML:

<ul class="menu">
  <li><a href="#">blah</a>
    <ul class="sub-menu">
      <li><a href="#">blah</a></li>
    </ul>
  </li>
</ul>

CSS:

/* NAVIGATION -- level 1 */
ul.menu { float: right; list-style-type: none; font-size: 15px; margin-top: 50px; }
ul.menu > li{ float: right; display: inline; position: relative; margin-left: 30px; }
ul.menu li > a { display: block; color: #5c5d5f; text-decoration: none; border-bottom: solid 1px #9b9a95;  }

ul.menu li:hover > a, ul.menu li a:hover , ul.menu li.current_page_item > a { color: black; }
body.home .current_page_item > a { }
body.home .current_page_item > a:hover { }

/* NAVIGATION -- level 2 */
ul.menu li > div { display: none; width: 157px; height: 171px; margin-right: -10px; position: absolute; opacity:0; background: url(images/subNav_bg.png) no-repeat top right; }

ul.menu li > div span { height: 15px; background: transparent; display: block; } /* used to push down the menu */

JS:

// navigation menu //
// add hasSubMenu to each li that has one //
$('.menu > li').has('ul').addClass('hasSubMenu');

// wrap with <div> //
$('li.hasSubMenu > ul').wrap('<div />');
$('ul.menu li > div').css('display', 'none');
$('ul.menu li > div').prepend('<span></span>');
$('li.hasSubMenu > a').click(function () {
    return false;
});

// add class to <div> for extendedBg //
$('li.extendedBg').find('div').addClass('subBg2');

$('li.hasSubMenu').hover(function () {
    // hover on
    $(this).addClass('hover').find('div').stop().fadeTo("medium", 1, /* when done fading */
        function () {
            $(this).find('div').css('display', 'block');
            //$(this).find('ul').css('display','block');
        }
    );

}, function () {
    // hover off
    $(this).removeClass('hover').find('div').stop().fadeOut();
});

Answer 1

Set the dropdown menu as display: none in the page's CSS or directly in the element itself using style="display:none". This will hide it as the page loads.

Answer 2

I have the same issue :( except when i used the css to hide it on load, i now have the problem that it never displays! even when hovering over the parent...

Even before i posted my reply i thought id try one more thing

#navigation ul ul{
    display:none;
}

instead of

#navigation ul ul li{
    display:none;
}

and now it works perfectly