var ajaxRequest;
var tableLoaded;
$(document).ready(function() {

    if (!tableLoaded) {
        tableLoaded = PreloadFaxData();
    }
});

function PreloadFaxData() {
    return $.ajax({
            type: "POST",
            url: "Default.aspx/PreLoadFaxData",
            contentType: "application/json; charset=utf-8",
            data: "{}",
            dataType: "json",  //Valid paramater format for json is '{"field":"fieldvalue", "field2":"field2vale"}'
            success: "",
            error: function (result) { console.log(result); }
        });
}