var $j = jQuery.noConflict();

var timer;
function setNavEvent(objId,isOver){
    var obj=$j('#'+objId);
    //$j(obj).find('ul').hide();
    var arrLi=document.getElementById('nav').getElementsByTagName('li');
    for (var i=0;i<arrLi.length;i++){
        if (arrLi[i].id==objId) continue;
        $j(arrLi[i]).find('ul').hide();
    }
    if (isOver){
        clearTimeout(timer);
        timer = setTimeout(
            function() {
                $j(obj).find('ul').slideDown('fast');
                $j('.img_page').css({'opacity':'0.5','filter': 'alpha(opacity = 50)'});
                $j('.lof-slidecontent').css({'opacity':'0.4'});
                $j('ul.lof-main-wapper li img').css({'filter': 'alpha(opacity = 40)'});
            }
            ,50)
    }else{
        clearTimeout(timer);
        timer = setTimeout(
            function() {
                $j(obj).find('ul').slideUp('fast');
		        $j('.img_page').css({'opacity':'1','filter': 'alpha(opacity = 100)'});
		        $j('.lof-slidecontent').css({'opacity':'1'});
		        $j('ul.lof-main-wapper li img').css({'filter': 'alpha(opacity = 100)'});
		    }
		    ,50)
    }
}