function tryJSON(app) {
    var url = '/cgi-bin/TryCGIApp.cgi';
    var params = "mode=blackout";
    new Ajax.Request(url, {
        onSuccess : function(resp,jsonheader) {
            var foo = jsonheader.boStatus;
            var funk = jsonheader.boError;
            alert("The response from the server is: " + foo + " and " + funk);
        },
        onFailure : function(resp) {
            alert("Oops, there's been an error.");
        },
        parameters : params
    });
}