Bind data to subgrid dynamically in CRM 2011

The following javascript web resource is used for bind data which is account related activities to subgrid with help of account number.

This is a special functionality in crm 2011.

When we entering a account number, automatically bind that account related activities using onkeyup(it is an event for textbox).

function SetSubGridInfo(accnum) {
    var ProjectGrid = document.getElementById("Activities_Subgrid");
    if (ProjectGrid == null || ProjectGrid.readyState != "complete") {
        setTimeout(SetSubGridInfo, 500);
        return;
    }
    var fetchxml = "<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>";
    fetchxml += "<entity name='activitypointer'>";
    fetchxml += "<attribute name='subject' />";
    fetchxml += "<attribute name='ownerid' />";
    fetchxml += "<attribute name='prioritycode' />";
    fetchxml += "<attribute name='regardingobjectid' />";
    fetchxml += "<attribute name='activitytypecode' />";
    fetchxml += "<attribute name='statecode' />";
    fetchxml += "<attribute name='scheduledstart' />";
    fetchxml += "<attribute name='scheduledend' />";
    fetchxml += "<attribute name='activityid' />";
    fetchxml += "<attribute name='instancetypecode' />";
    fetchxml += "<order attribute='scheduledend' descending='false' />";
    fetchxml += "<filter type='and'>";
    fetchxml += "<condition attribute='isregularactivity' operator='eq' value='1' />";
    fetchxml += "</filter>";
    fetchxml += "<link-entity name='systemuser' from='systemuserid' to='owninguser' visible='false' link-type='outer' alias='activitypointerowningusersystemusersystemuserid'>";
    fetchxml += "<attribute name='internalemailaddress' />";
    fetchxml += "</link-entity>";
    fetchxml += "<link-entity name='account' from='accountid' to='regardingobjectid' alias='aa'>";
    fetchxml += "<filter type='and'>";
    fetchxml += "<condition attribute='accountnumber' operator='eq' value='" + anum + "' />";
    fetchxml += "</filter>";
    fetchxml += "</link-entity>";
    fetchxml += "</entity>";
    fetchxml += "</fetch>";
    ProjectGrid.control.setParameter("fetchxml", fetchxml);
    ProjectGrid.control.refresh();
}
function registerOnKeyUp() {
    var attr = "new_accountnumber";
    var el = document.getElementById(attr);
    el.onkeyup = function () {
        var edValue = document.getElementById(attr);
        var s = edValue.value;
        SetSubGridInfo(s);
    }
}