全选 jquery

$("#checkAllSelectedOrganization").live("click", function() {
    $('input[name="selected_org"]').attr("checked",this.checked);
});
var $selected_organization = $("input[name='selected_org']");
$selected_organization.live("click", function(){
    $("#checkAllSelectedOrganization").attr("checked",
        $("input[name='selected_org']").length == $("input[name='selected_org']:checked").length ? true : false);
});