Consume the Web Service Asynchronously from html javascript

function InfoByDate(sDate, eDate){
    var divToBeWorkedOn = '#AjaxPlaceHolder';
    var webMethod = 'http://MyWebService/Web.asmx/GetInfoByDates'
    var parameters = "{'sDate':'" + sDate + "','eDate':'" + eDate + "'}"

    $.ajax({
        type: "POST",
        url: webMethod,
        data: parameters,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(msg) {    
            $(divToBeWorkedOn).html(msg.d);
        },
        error: function(e){
            $(divToBeWorkedOn).html("Unavailable");              
        }
    });
}