Method to load a SWF or JPG file into an existing MovieClip.
First available in version 3.0 build 2039.
Not available in ActionScript 3.
url - String - The location of the SWF or JPG file to be loaded.
target - MovieClip | String | Number - The movieclip or level that will have its contents replaced with the SWF or JPG file specified in the url parameter.