jQuery Dropdownmenü "click" zuklappen

<script type="text/javascript">
/*********************
//* jQuery Multi Level CSS Menu (horizontal)- By Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//* Menu instructions page: http://www.dynamicdrive.com/dynamicindex1/ddlevelsmenu/
//* Last modified: Sept 6th, 08'. Usage Terms: http://www.dynamicdrive.com/style/csslibrary/tos/
*********************/


//Specify full URL to down and right arrow images (25 is padding-right to add to top level LIs with drop downs):
var arrowimages={down:['downarrowclass', 'arrow-down.gif', 25], right:['rightarrowclass', 'arrow-right.gif']}


var jquerycssmenu={


fadesettings: {overduration: 350, outduration: 100}, //duration of fade in/ out animation, in milliseconds


buildmenu:function(menu_css, arrowsvar){
    jQuery(document).ready(function($){
        var $mainmenu=$(menu_css+">ul")
        var $headers=$mainmenu.find("ul").parent()
        $headers.each(function(i){
            var $curobj=$(this)
            var $subul=$(this).find('ul:eq(0)')
            this._dimensions={w:this.offsetWidth, h:this.offsetHeight, subulw:$subul.outerWidth(), subulh:$subul.outerHeight()}
            this.istopheader=$curobj.parents("ul").length==1? true : false
            $subul.css({top:this.istopheader? this._dimensions.h+"px" : 0})
            $curobj.children("a:eq(0)").css(this.istopheader? {paddingRight: arrowsvar.down[2]} : {}).append(
                '<img src="'+ (this.istopheader? arrowsvar.down[1] : arrowsvar.right[1])
                +'" class="' + (this.istopheader? arrowsvar.down[0] : arrowsvar.right[0])
                + '" style="border:0;" />'
            )
            $curobj.click(
                function(e){
                    var $targetul=$(this).children("ul:eq(0)")
                    $targetul.addClass('js_myActiveMenu');
                    this._offsets={left:$(this).offset().left, top:$(this).offset().top}
                    var menuleft=this.istopheader? 0 : this._dimensions.w
                    menuleft=(this._offsets.left+menuleft+this._dimensions.subulw>$(window).width())? (this.istopheader? -this._dimensions.subulw+this._dimensions.w : -this._dimensions.w) : menuleft
                    $targetul.css({left:menuleft+"px"}).fadeIn(jquerycssmenu.fadesettings.overduration)
                }
            ) //end hover
        }) //end $headers.each()
        $mainmenu.find("ul").css({display:'none', visibility:'visible'})
    }) //end document.ready
}
}


//build menu with ID="myjquerymenu" on page:
jquerycssmenu.buildmenu(".jquerycssmenu", arrowimages);


//schliessen-funktion
$(document).bind("click", function(){
    $('.js_myActiveMenu').fadeOut(jquerycssmenu.fadesettings.outduration);
});
</script>