function AutoFillActivity()

{

    var mb_cityidname = document.all.crmForm.mb_cityid.DataValue;

    var MycityId = mb_cityidname[0].id;

    var submitUrl = CUSTOM_WEB_URL + "/Common/XMLRetrieveActivityInformation.aspx?cityid=" + MycityId;

    var oXml = GetXmlDocument(submitUrl);

    if (GetValue(oXml, "IsSucceed") == "False")

    {   alert(GetValue(oXml, "ErrorMessage")); return;   }

    else

    {

        var ActivityId = GetValue(oXml, "mb_activitysiteid");

        if ( ActivityId != null && ActivityId != "NULL")

        {

            var ActivityName = GetValue(oXml, "mb_activitysiteidname");

            var lookupData = new Array();

            var lookupItem2 = new Object();

            lookupItem2.id = ActivityId;

            lookupItem2.typename = 'mb_activitysite';

            lookupItem2.name = ActivityName;

            lookupData[0] = lookupItem2;

            crmForm.all.mb_activitysiteid.DataValue = lookupData;

        }

        else

        {    crmForm.all.mb_activitysiteid.DataValue = null;    }

    }

}