var amount = null;
var mySearch = search.load(searchID);
var filters = mySearch.filters;
for (var i = 0; i < filters.length; i++) {
    if (filters[i].name === "salesrep") {
        filters[i].values = employee;
    }
}
var startDate = search.createFilter({name: 'closedate', operator: search.Operator.ONORAFTER, values: [YTDRange.startDate]});
filters.push(startDate);
var endDate = search.createFilter({name: 'closedate', operator: search.Operator.ONORBEFORE, values: [YTDRange.endDate]});
filters.push(endDate);
mySearch.run().each(function(result) {
    amount = result.getValue({name: 'amount', summary: 'SUM'});
});