attachevent on SubGrid onrefresh event

I wrote some some JavaScript code in CRM 4.0 that triggers when the datagrid inside of an IFrame refreshes.  I have upgraded the system to CRM 2011 and changed the IFrame to a SubGrid.  Now I am trying to use JavaScript to attach the function to the onrefresh event and can't seem to get it to work.

This is the old code I need to reproduce.

if (crmForm.FormType != 1) {

    crmForm.all.IFRAME_OpportunityLines.src = GetFrameSource("fj_opportunity_new_opportunitymanagementmodu");
    crmForm.all.IFRAME_OpportunityLines.onreadystatechange = function oppLineTotals() {
        if (crmForm.all.IFRAME_OpportunityLines.readyState == 'complete') {
            var iFrame = frames[window.event.srcElement.id];
            iFrame.document.all.crmGrid.attachEvent("onrefresh", GridRefresh);
        }
    }
}

Any help would be appreciated.