Default the Activities 'Filter on' to 'All' for Account and Contact - CRM 2011

Default the Activities 'Filter on' to 'All' for Account and Contact

 

//default the Activities 'Filter on' to 'All' for Account and Contact 

function filterAllActivities() {
    document.getElementById("navActivities").onclick = function () {
        loadArea("areaActivities"); 

        document.getElementById("areaActivitiesFrame").onload = function () {
            var entityName = Xrm.Page.data.entity.getEntityName();
            var entity = entityName.charAt(0).toUpperCase() + entityName.substr(1);
            var doc = this.contentWindow.document;
            var filterOn = doc.getElementById("crmGrid_" + entity + "_ActivityPointers_datefilter"); 

            filterOn.value = "All";
            filterOn.FireOnChange();
        };
    };