1.布局：
2.js控制：
var t1;
function expand() {
clearTimeout(t1);
//theSpan.find('a').addClass("selected");
theMenu.stop().show().animate({ height: tarHeight,opacity: 1 },200);
}
function collapse() {
clearTimeout(t1);
t1 = setTimeout(function () {
// theSpan.find('a').removeClass("selected");
theMenu.stop().animate({ height: 0,opacity: 0 },200,function () {
$(this).css({ display: "none" });
});
},250);
}
theSpan.hover(expand,collapse);
theMenu.hover(expand,collapse);
});
}
