If you pass a param to the json call, it gets passed into the querystring:
$.getJSON("jsdata/customerhandler.ashx", { show: Math.random(),
departmentId: dptId}, customerLoaded);
would be rendered as:
jsdata/customerhandler.ashx?show=0.23231553&departmentId=123
the second parameter to the getJson function is the query string
parameters.
