自动弹出div菜单

[javascript]
(function($){
/**
menus:菜单数据，json数据格式，每个menu json必须包含有两个个key，1、url，表示点击菜单是需要跳转的位置；2、name，显示的菜单名称；3、cssClass，当前菜单的样式
settings：对框的显示设置，width：宽；height：高；top：顶部距离；left：左边距离；cssClass：整个框的样式;cols:显示几列
*/
$.fn.showMenu = function(menus,settings){
    var tableId = '_show_Menu_id_';
    var cols = settings && settings.cols ? settings.cols : 2;
    var _left = settings && settings.left ? settings.left : 0;
    var _top = settings && settings.top ? settings.top : 0;
    var _width = settings && settings.width ? settings.width : 0;
    var _height = settings && settings.height ? settings.height : 0;

    var lt = function(){
        var p = this;
        var left = $(this).offset().left;
        var top = $(this).offset().top;
        while(p.get(0).tagName != 'HTML' && p.get(0).tagName != 'html' ){
            p = p.parent();
            left += $(p).offset().left;
            top += $(p).offset().top;
        }
        return {left:left,top:top};
    }
    var offset = lt.apply(this);
    offset.left = offset.left + this.width()-8 + _left;
    offset.top   = offset.top-this.height()+5+_top;
    var tdCss = {'border-top':'1px solid #ffffff','border-right':'1px solid #ffffff','background-color':'#E8E8E8',cursor:'hand'};
    var d = function(){
        var $mdiv = $('<div></div>');
        $mdiv.attr('id',tableId);
        $mdiv.css({border:'1px solid #B0C4DE',position:'absolute',display:'none','z-index':9999,left:offset.left,top:offset.top});
        if(_width > 0){
            $mdiv.width(_width);
        }
        if(_height > 0){
            $mdiv.heigth(_height);
        }

        var $table = $('<table cellspacing=0 cellpading=0 ></table>');
        $table.css({'background-color':'#E8E8E8',border:'0px'});
        var index = 0;
        var $tr ;
        $(menus).each(function(){
            if(index % cols == 0){
                $tr = $('<tr></tr>');
                $table.append($tr);
            }
            var $td = $('<td nowrap url='+this.url+'>'+this.name+'</td>');
            $td.css(tdCss);
            if(this.cssClass){
                $td.addClass(this.cssClass);
            }
            $tr.append($td);
            index++;
        });

        if(menus.length % cols != 0){
            for(var i = cols -( menus.length % cols); i > 0 ; i--){
                var $td = $('<td nowrap> </td>');
                $td.css(tdCss);
                $tr.append($td);
            }
        }
        var tdbg;
        $table.find('td').each(function(){
            var url = $(this).attr('url');
            if(url && url != ''){
                $(this).click(function(){
                    $table.find('td').css('background-color','#E8E8E8');
                    $(this).css('background-color','#DB9D9B');
                    hidebox();
                    top.document.location = url;
                });
            }
            $(this).mouseover(function(){
                tdbg = $(this).css('background-color');
                $(this).css('background-color','#A2ECAD');
            }).mouseout(function(){

补充：web前端 , JavaScript ,