Help replacing Mouseenter event

Help replacing Mouseenter event

Hello all. If anyone can help me, I'd very much appreciate it! 

Basically I'd like the "menu" to animate up upon loading the entire page and remain as such. With the code below, it only pops up when the mouseenter event is triggered.
     

  1.       $et_main_header.live( {
                    mouseenter: function(){
                        $main_menu.css({'display':'none','opacity':'1'}).stop(true,false).slideDown(menu_slide_speed);
                    },
                    mouseleave: function(){
                        $main_menu.slideUp(menu_slide_speed);
                    }
                } );







I can also do without the mouseleave event all together.

Thanks in advance!