jquery does not working on IE

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ASP.NET

jQuery

IE8

heyy..

I am using a jquery for menu(having Li and ul) but jquery is does not work on IE...

Here is My jquery...

$(function() {
    if ($.browser.msie && $.browser.version.substr(0, 1) < 7) {
        $('li').has('ul').mouseover(function() {
            $(this).children('ul').css('visibility', 'visible');
        }).mouseout(function() {
            $(this).children('ul').css('visibility', 'hidden');
        })
    }

    /* Mobile */
    $('#menu-wrap').prepend('<div id="menu-trigger">Menu</div>');
    $("#menu-trigger").on("click", function() {
        $("#menu").slideToggle();
    });

    // iPad
    var isiPad = navigator.userAgent.match(/iPad/i) != null;
    if (isiPad) $('#menu ul').addClass('no-transition');
});

any thing wrong in jquery?