var script_name = "ui_demo.jsx";
var currentPath = (new File($.fileName)).path; // retrieve the current script path
var scriptToLoad = new File (currentPath + "/"+script_name); // the script to load
try {
    if (!scriptToLoad.exists) { throw new Error("script not found!"); }
    scriptToLoad.open ("r"); // read only
    var message = scriptToLoad.read();
    scriptToLoad.close();
} catch (error) {
    alert("Error parsing the file: " + error.description);
}
var bt = new BridgeTalk();
bt.target = "photoshop";
bt.body = message;
bt.send();