How to pass json file name dynamically

for loading of diagram i am passing json file name to getjson method that is hard coded,but i want it to be dynamic, means when we pass json file name dynamically at run time, it should load that json file and generate diagram.
LoadJsonData(“audit_GetLog_1.json”);\- how can we paas this parameter dynamically.
function LoadJsonData(total) {
jQuery.getJSON(total, loadjson);
//jQuery.parseJSON(total, loadjson);
function loadjson(jsondata) {
// create the model from the data in the JavaScript object parsed from JSON text

        nodeDataArray1 = jsondata["nodeDataArray"];
        linkDataArray1 = jsondata["linkDataArray"];

That’s not a GoJS question – it’s just a matter of calling that function with a different string.