[Diomas]

Это, кажись, не метод называется (в тройке-то).
Когда ты испоьзуешь loadMovie через точку, там другие параметры:

MovieClip.loadMovie
Availability
Flash Player 5.
Usage
myMovieClip.loadMovie("url" [,variables])
Parameters
url An absolute or relative URL of the SWF or JPEG file to be loaded. A relative path must be relative to the SWF file at _level0. The URL must be in the same subdomain as the URL where the movie currently resides. For use in the stand-alone Flash Player or for testing in test mode in the Flash authoring application, all SWF files must be stored in the same folder, and the filenames cannot include folder or disk drive specifications.
variables An optional parameter specifying an HTTP method for sending or loading variables. The parameter must be the string GET or POST. If there are no variables to be sent, omit this parameter. The GET method appends the variables to the end of the URL, and is used for small numbers of variables. The POST method sends the variables in a separate HTTP header and is used for long strings of variables.