How to access toolbar elements from Javascript

[Webmaster]

If I am implementing a standalone Javascript file that is launched off of a button (following the example of the Launch function in the demos), how do I get to the different elements that I have added to the tool bar within the script? I have gotten the MainWindow context working properly within my script but I would like to be able to access two text fields on my toolbar (username_edit and password_edit) and use their values in my script.

[Admin]

You need to use the following Launch function in Custom Script

function Launch(tool)
{
var c_val;
c_val=tool.GetPropertyById("tbs_combo_013736", "value");
MainWindow.document.parentWindow.alert(c_val);
}