Refresh Subgrid in MS CRM 2011

function SubGridRefresh() {

    var grid = document.getElementById("subgrid1");

    if (!grid) {

        setTimeout("SubGridRefresh();", 1000);

        return;

    }

    else {

        grid.control.add_onRefresh(AlertFun);

    }

}

function AlertFun() {

    alert('SubGrid has been Refreshed');

}